From 883e3408c81f7141d801faab57765a60faa60809 Mon Sep 17 00:00:00 2001
From: stefan6419846 <96178532+stefan6419846@users.noreply.github.com>
Date: Wed, 26 Feb 2025 14:13:41 +0100
Subject: [PATCH] ROB: Ignore non-numbers for width when building font width
 map

Closes #3153.
---
 pypdf/_cmap.py     |  4 ++++
 tests/test_cmap.py | 12 ++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/pypdf/_cmap.py b/pypdf/_cmap.py
index f4b5e4b4c..d476cd571 100644
--- a/pypdf/_cmap.py
+++ b/pypdf/_cmap.py
@@ -423,6 +423,10 @@ def build_font_width_map(
                 # C_first C_last same_W
                 en = second
                 width = w[2].get_object()
+                if not isinstance(width, (int, float)):
+                    logger_warning(f"Expected numeric value for width, got {width}. Ignoring it.", __name__)
+                    w = w[3:]
+                    continue
                 for c_code in range(st, en + 1):
                     font_width_map[chr(c_code)] = width
                 w = w[3:]
diff --git a/tests/test_cmap.py b/tests/test_cmap.py
index 94f4c5a8b..2d9e4bbea 100644
--- a/tests/test_cmap.py
+++ b/tests/test_cmap.py
@@ -305,3 +305,15 @@ def test_standard_encoding(caplog):
     page = reader.pages[0]
     assert page.extract_text() == "Lorem ipsum"
     assert "Advanced encoding" not in caplog.text
+
+
+@pytest.mark.enable_socket
+def test_function_in_font_widths(caplog):
+    """Tests for #3153"""
+    url = "https://github.com/user-attachments/files/18945709/Marseille_pypdf_level_0.2._compressed.pdf"
+    name = "issue3153.pdf"
+    reader = PdfReader(BytesIO(get_data_from_url(url, name=name)))
+
+    page = reader.pages[455]
+    assert "La vulnérabilité correspond aux conséquences potentielles" in page.extract_text()
+    assert "Expected numeric value for width, got {'/Bounds': [0.25, 0.25]," in caplog.text