From 63b34114b114f91f990ab0d024c26d6458d2879e Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Tue, 22 Oct 2024 11:38:00 +0200
Subject: [PATCH] Fallback to a standard font if a font-file entry doesn't
 contain a Stream (issue 18941)

The PDF document is clearly corrupt, since it has /FontFile2 entries that are Dictionaries which obviously isn't correct.
While there's obviously no guarantee that things will look perfect this way, actually rendering the text at all should be an improvement in general.
---
 src/core/evaluator.js         | 10 ++++++++++
 test/pdfs/issue18941.pdf.link |  1 +
 test/test_manifest.json       |  9 +++++++++
 3 files changed, 20 insertions(+)
 create mode 100644 test/pdfs/issue18941.pdf.link

diff --git a/src/core/evaluator.js b/src/core/evaluator.js
index c906abce5..1600f098a 100644
--- a/src/core/evaluator.js
+++ b/src/core/evaluator.js
@@ -4436,6 +4436,16 @@ class PartialEvaluator {
     let glyphScaleFactors = null;
     let systemFontInfo = null;
     if (fontFile) {
+      if (!(fontFile instanceof BaseStream)) {
+        const msg = `Font file should be a Stream in "${fontName.name}".`;
+
+        if (!this.options.ignoreErrors) {
+          throw new FormatError(msg);
+        }
+        warn(msg);
+        fontFile = new NullStream();
+      }
+
       if (fontFile.dict) {
         const subtypeEntry = fontFile.dict.get("Subtype");
         if (subtypeEntry instanceof Name) {
diff --git a/test/pdfs/issue18941.pdf.link b/test/pdfs/issue18941.pdf.link
new file mode 100644
index 000000000..d2402e740
--- /dev/null
+++ b/test/pdfs/issue18941.pdf.link
@@ -0,0 +1 @@
+https://github.com/user-attachments/files/17473385/21_10_2024_FAMI.INVERSION.SAS_901060703_inicial.pdf
diff --git a/test/test_manifest.json b/test/test_manifest.json
index 749cdf6c8..38698ad8a 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -2352,6 +2352,15 @@
     "lastPage": 3,
     "type": "eq"
   },
+  {
+    "id": "issue18941",
+    "file": "pdfs/issue18941.pdf",
+    "md5": "6288e69c1dd240859c1d49c22a53a5c7",
+    "rounds": 1,
+    "link": true,
+    "lastPage": 1,
+    "type": "eq"
+  },
   {
     "id": "f1040",
     "file": "pdfs/f1040.pdf",