diff --git a/src/core/evaluator.js b/src/core/evaluator.js
index c906abce558ab..2828893474a8f 100644
--- a/src/core/evaluator.js
+++ b/src/core/evaluator.js
@@ -63,7 +63,6 @@ import {
   LocalTilingPatternCache,
   RegionalImageCache,
 } from "./image_utils.js";
-import { NullStream, Stream } from "./stream.js";
 import { BaseStream } from "./base_stream.js";
 import { bidi } from "./bidi.js";
 import { ColorSpace } from "./colorspace.js";
@@ -77,6 +76,7 @@ import { ImageResizer } from "./image_resizer.js";
 import { MurmurHash3_64 } from "../shared/murmurhash3.js";
 import { OperatorList } from "./operator_list.js";
 import { PDFImage } from "./image.js";
+import { Stream } from "./stream.js";
 
 const DefaultPartialEvaluatorOptions = Object.freeze({
   maxImageSize: -1,
@@ -4425,12 +4425,20 @@ class PartialEvaluator {
     let fontFile, subtype, length1, length2, length3;
     try {
       fontFile = descriptor.get("FontFile", "FontFile2", "FontFile3");
+
+      if (fontFile) {
+        if (!(fontFile instanceof BaseStream)) {
+          throw new FormatError("FontFile should be a stream");
+        } else if (fontFile.isEmpty) {
+          throw new FormatError("FontFile is empty");
+        }
+      }
     } catch (ex) {
       if (!this.options.ignoreErrors) {
         throw ex;
       }
       warn(`translateFont - fetching "${fontName.name}" font file: "${ex}".`);
-      fontFile = new NullStream();
+      fontFile = null;
     }
     let isInternalFont = false;
     let glyphScaleFactors = null;
diff --git a/test/pdfs/issue18941.pdf.link b/test/pdfs/issue18941.pdf.link
new file mode 100644
index 0000000000000..d2402e7405df0
--- /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 749cdf6c88c2f..38698ad8a4d03 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",