diff --git a/swh/lister/maven/lister.py b/swh/lister/maven/lister.py
--- a/swh/lister/maven/lister.py
+++ b/swh/lister/maven/lister.py
@@ -4,6 +4,7 @@
 # See top-level LICENSE file for more information
 
 from dataclasses import asdict, dataclass
+from datetime import datetime, timezone
 import logging
 import re
 from typing import Any, Dict, Iterator, Optional
@@ -274,6 +275,7 @@
 
         """
         assert self.lister_obj.id is not None
+        scm_types_ok = ("git", "svn", "hg", "cvs", "bzr")
         if page["type"] == "scm":
             # If origin is a scm url: detect scm type and yield.
             # Note that the official format is:
@@ -283,11 +285,12 @@
             m_scm = re.match(r"^scm:(?P<type>[^:]+):(?P<url>.*)$", page["url"])
             if m_scm is not None:
                 scm_type = m_scm.group("type")
-                scm_url = m_scm.group("url")
-                origin = ListedOrigin(
-                    lister_id=self.lister_obj.id, url=scm_url, visit_type=scm_type,
-                )
-                yield origin
+                if scm_type in scm_types_ok:
+                    scm_url = m_scm.group("url")
+                    origin = ListedOrigin(
+                        lister_id=self.lister_obj.id, url=scm_url, visit_type=scm_type,
+                    )
+                    yield origin
             else:
                 if page["url"].endswith(".git"):
                     origin = ListedOrigin(
@@ -296,14 +299,25 @@
                     yield origin
         else:
             # Origin is a source archive:
+            last_update_dt = None
+            last_update_iso = ""
+            last_update_seconds = str(page["time"])[:-3]
+            try:
+                last_update_dt = datetime.fromtimestamp(int(last_update_seconds))
+                last_update_dt_tz = last_update_dt.astimezone(timezone.utc)
+            except OverflowError:
+                logger.warning("- Failed to convert datetime %s.", last_update_seconds)
+            if last_update_dt:
+                last_update_iso = last_update_dt_tz.isoformat()
             origin = ListedOrigin(
                 lister_id=self.lister_obj.id,
                 url=page["url"],
                 visit_type=page["type"],
+                last_update=last_update_dt,
                 extra_loader_arguments={
                     "artifacts": [
                         {
-                            "time": page["time"],
+                            "time": last_update_iso,
                             "gid": page["gid"],
                             "aid": page["aid"],
                             "version": page["version"],
diff --git a/swh/lister/maven/tests/data/https_maven.org/sprova4j-0.1.0.malformed.pom b/swh/lister/maven/tests/data/https_maven.org/sprova4j-0.1.0.malformed.pom
new file mode 100644
--- /dev/null
+++ b/swh/lister/maven/tests/data/https_maven.org/sprova4j-0.1.0.malformed.pom
@@ -0,0 +1,86 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>al.aldi</groupId>
+  <artifactId>sprova4j</artifactId>
+  <version>0.1.0</version>
+  <name>sprova4j</name>
+  <description>Java client for Sprova Test Management</description>
+  <url>https://github.com/aldialimucaj/sprova4j</url>
+  <inceptionYear>2018</inceptionYear>
+  <licenses>
+    <license>
+      <name>The Apache Software License, Version 2.0</name>
+      <url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
+      <distribution>repo</distribution>
+    </license>
+  </licenses>
+  <developers>
+    <developer>
+      <id>aldi</id>
+      <name>Aldi Alimucaj</name>
+      <email>aldi.alimucaj@gmail.com</email>
+    </developer>
+  </developers>
+  <scm>
+    <connection>scm:https://github.com/aldialimucaj/sprova4j.git</connection>
+    <developerConnection>scm:ghttps://github.com/aldialimucaj/sprova4j.git</developerConnection>
+    <url>https://github.com/aldialimucaj/sprova4j</url>
+  </scm>
+  <dependencies>
+    <dependency>
+      <groupId>ch.qos.logback</groupId>
+      <artifactId>logback-classic</artifactId>
+      <version>1.2.3</version>
+      <scope>runtime</scope>
+    </dependency>
+    <dependency>
+      <groupId>com.google.code.gson</groupId>
+      <artifactId>gson</artifactId>
+      <version>2.8.3</version>
+      <scope>runtime</scope>
+    </dependency>
+    <dependency>
+      <groupId>com.squareup.okhttp3</groupId>
+      <artifactId>okhttp</artifactId>
+      <version>3.10.0</version>
+      <scope>runtime</scope>
+    </dependency>
+    <dependency>
+      <groupId>com.squareup.okio</groupId>
+      <artifactId>okio</artifactId>
+      <version>1.0.0</version>
+      <scope>runtime</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.glassfish</groupId>
+      <artifactId>javax.json</artifactId>
+      <version>1.1.2</version>
+      <scope>runtime</scope>
+    </dependency>
+    <dependency>
+      <groupId>javax.json</groupId>
+      <artifactId>javax.json-api</artifactId>
+      <version>1.1.2</version>
+      <scope>runtime</scope>
+    </dependency>
+    <dependency>
+      <groupId>javax.validation</groupId>
+      <artifactId>validation-api</artifactId>
+      <version>2.0.1.Final</version>
+      <scope>runtime</scope>
+    </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.12</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>com.squareup.okhttp3</groupId>
+      <artifactId>mockwebserver</artifactId>
+      <version>3.10.0</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+</project>
diff --git a/swh/lister/maven/tests/test_lister.py b/swh/lister/maven/tests/test_lister.py
--- a/swh/lister/maven/tests/test_lister.py
+++ b/swh/lister/maven/tests/test_lister.py
@@ -3,8 +3,10 @@
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
+from datetime import timezone
 from pathlib import Path
 
+import iso8601
 import pytest
 import requests
 
@@ -34,7 +36,7 @@
         "type": "maven",
         "url": "https://repo1.maven.org/maven2/al/aldi/sprova4j"
         + "/0.1.0/sprova4j-0.1.0-sources.jar",
-        "time": 1626109619335,
+        "time": "2021-07-12T17:06:59+00:00",
         "gid": "al.aldi",
         "aid": "sprova4j",
         "version": "0.1.0",
@@ -43,7 +45,7 @@
         "type": "maven",
         "url": "https://repo1.maven.org/maven2/al/aldi/sprova4j"
         + "/0.1.1/sprova4j-0.1.1-sources.jar",
-        "time": 1626111425534,
+        "time": "2021-07-12T17:37:05+00:00",
         "gid": "al.aldi",
         "aid": "sprova4j",
         "version": "0.1.1",
@@ -53,32 +55,32 @@
 
 @pytest.fixture
 def maven_index(datadir) -> str:
-    text = Path(datadir, "http_indexes", "export.fld").read_text()
-    return text
+    return Path(datadir, "http_indexes", "export.fld").read_text()
 
 
 @pytest.fixture
 def maven_index_incr(datadir) -> str:
-    text = Path(datadir, "http_indexes", "export_incr.fld").read_text()
-    return text
+    return Path(datadir, "http_indexes", "export_incr.fld").read_text()
 
 
 @pytest.fixture
 def maven_pom_1(datadir) -> str:
-    text = Path(datadir, "https_maven.org", "sprova4j-0.1.0.pom").read_text()
-    return text
+    return Path(datadir, "https_maven.org", "sprova4j-0.1.0.pom").read_text()
+
+
+@pytest.fixture
+def maven_pom_1_malformed(datadir) -> str:
+    return Path(datadir, "https_maven.org", "sprova4j-0.1.0.malformed.pom").read_text()
 
 
 @pytest.fixture
 def maven_pom_2(datadir) -> str:
-    text = Path(datadir, "https_maven.org", "sprova4j-0.1.1.pom").read_text()
-    return text
+    return Path(datadir, "https_maven.org", "sprova4j-0.1.1.pom").read_text()
 
 
 @pytest.fixture
 def maven_pom_3(datadir) -> str:
-    text = Path(datadir, "https_maven.org", "arangodb-graphql-1.2.pom").read_text()
-    return text
+    return Path(datadir, "https_maven.org", "arangodb-graphql-1.2.pom").read_text()
 
 
 def test_maven_full_listing(
@@ -117,6 +119,10 @@
         if origin.visit_type == "maven":
             for src in LIST_SRC_DATA:
                 if src.get("url") == origin.url:
+                    last_update_src = iso8601.parse_date(src.get("time")).astimezone(
+                        tz=timezone.utc
+                    )
+                    assert last_update_src == origin.last_update
                     artifact = origin.extra_loader_arguments["artifacts"][0]
                     assert src.get("time") == artifact["time"]
                     assert src.get("gid") == artifact["gid"]
@@ -125,7 +131,68 @@
                     assert MVN_URL == artifact["base_url"]
                     break
             else:
-                raise AssertionError
+                raise AssertionError(
+                    "Could not find scheduler origin in reference origins."
+                )
+    scheduler_state = lister.get_state_from_scheduler()
+    assert scheduler_state is not None
+    assert scheduler_state.last_seen_doc == -1
+    assert scheduler_state.last_seen_pom == -1
+
+
+def test_maven_full_listing_malformed(
+    swh_scheduler,
+    requests_mock,
+    mocker,
+    maven_index,
+    maven_pom_1_malformed,
+    maven_pom_2,
+):
+    """Covers full listing of multiple pages, checking page results with a malformed
+    scm entry in pom."""
+
+    lister = MavenLister(
+        scheduler=swh_scheduler,
+        url=MVN_URL,
+        instance="maven.org",
+        index_url=INDEX_URL,
+        incremental=False,
+    )
+
+    # Set up test.
+    index_text = maven_index
+    requests_mock.get(INDEX_URL, text=index_text)
+    requests_mock.get(URL_POM_1, text=maven_pom_1_malformed)
+    requests_mock.get(URL_POM_2, text=maven_pom_2)
+
+    # Then run the lister.
+    stats = lister.run()
+
+    # Start test checks.
+    assert stats.pages == 4
+    assert stats.origins == 3
+
+    scheduler_origins = swh_scheduler.get_listed_origins(lister.lister_obj.id).results
+
+    origin_urls = [origin.url for origin in scheduler_origins]
+    LIST_SRC_1 = ("https://github.com/aldialimucaj/sprova4j.git",)
+    assert sorted(origin_urls) == sorted(LIST_SRC_1 + LIST_SRC)
+
+    for origin in scheduler_origins:
+        if origin.visit_type == "maven":
+            for src in LIST_SRC_DATA:
+                if src.get("url") == origin.url:
+                    artifact = origin.extra_loader_arguments["artifacts"][0]
+                    assert src.get("time") == artifact["time"]
+                    assert src.get("gid") == artifact["gid"]
+                    assert src.get("aid") == artifact["aid"]
+                    assert src.get("version") == artifact["version"]
+                    assert MVN_URL == artifact["base_url"]
+                    break
+            else:
+                raise AssertionError(
+                    "Could not find scheduler origin in reference origins."
+                )
     scheduler_state = lister.get_state_from_scheduler()
     assert scheduler_state is not None
     assert scheduler_state.last_seen_doc == -1