diff --git a/src/core/core_utils.js b/src/core/core_utils.js
index a84373d1614ac8..f3c48471f09c0d 100644
--- a/src/core/core_utils.js
+++ b/src/core/core_utils.js
@@ -670,6 +670,50 @@ function getSizeInBytes(x) {
   return Math.ceil(Math.ceil(Math.log2(1 + x)) / 8);
 }
 
+function getVerticalPresentationForm() {
+  return getLookupTableFactory(lookup => {
+    for (const [key, value] of [
+      // This table has been found at
+      // https://searchfox.org/mozilla-central/rev/cbdfa503a87597b20719aae5f6a1efccd6cb3b7b/gfx/thebes/gfxHarfBuzzShaper.cpp#251-294
+      [0x2013, 0xfe32], // EN DASH
+      [0x2014, 0xfe31], // EM DASH
+      [0x2025, 0xfe30], // TWO DOT LEADER
+      [0x2026, 0xfe19], // HORIZONTAL ELLIPSIS
+      [0x3001, 0xfe11], // IDEOGRAPHIC COMMA
+      [0x3002, 0xfe12], // IDEOGRAPHIC FULL STOP
+      [0x3008, 0xfe3f], // LEFT ANGLE BRACKET
+      [0x3009, 0xfe40], // RIGHT ANGLE BRACKET
+      [0x300a, 0xfe3d], // LEFT DOUBLE ANGLE BRACKET
+      [0x300b, 0xfe3e], // RIGHT DOUBLE ANGLE BRACKET
+      [0x300c, 0xfe41], // LEFT CORNER BRACKET
+      [0x300d, 0xfe42], // RIGHT CORNER BRACKET
+      [0x300e, 0xfe43], // LEFT WHITE CORNER BRACKET
+      [0x300f, 0xfe44], // RIGHT WHITE CORNER BRACKET
+      [0x3010, 0xfe3b], // LEFT BLACK LENTICULAR BRACKET
+      [0x3011, 0xfe3c], // RIGHT BLACK LENTICULAR BRACKET
+      [0x3014, 0xfe39], // LEFT TORTOISE SHELL BRACKET
+      [0x3015, 0xfe3a], // RIGHT TORTOISE SHELL BRACKET
+      [0x3016, 0xfe17], // LEFT WHITE LENTICULAR BRACKET
+      [0x3017, 0xfe18], // RIGHT WHITE LENTICULAR BRACKET
+      [0xfe4f, 0xfe34], // WAVY LOW LINE
+      [0xff01, 0xfe15], // FULLWIDTH EXCLAMATION MARK
+      [0xff08, 0xfe35], // FULLWIDTH LEFT PARENTHESIS
+      [0xff09, 0xfe36], // FULLWIDTH RIGHT PARENTHESIS
+      [0xff0c, 0xfe10], // FULLWIDTH COMMA
+      [0xff1a, 0xfe13], // FULLWIDTH COLON
+      [0xff1b, 0xfe14], // FULLWIDTH SEMICOLON
+      [0xff1f, 0xfe16], // FULLWIDTH QUESTION MARK
+      [0xff3b, 0xfe47], // FULLWIDTH LEFT SQUARE BRACKET
+      [0xff3d, 0xfe48], // FULLWIDTH RIGHT SQUARE BRACKET
+      [0xff3f, 0xfe33], // FULLWIDTH LOW LINE
+      [0xff5b, 0xfe37], // FULLWIDTH LEFT CURLY BRACKET
+      [0xff5d, 0xfe38],
+    ]) {
+      lookup[key] = value;
+    }
+  })();
+}
+
 export {
   arrayBuffersToBytes,
   codePointIter,
@@ -682,6 +726,7 @@ export {
   getNewAnnotationsMap,
   getRotationMatrix,
   getSizeInBytes,
+  getVerticalPresentationForm,
   isAscii,
   isBooleanArray,
   isNumberArray,
diff --git a/src/core/fonts.js b/src/core/fonts.js
index 52994267da4627..d4a1a8e455b3c9 100644
--- a/src/core/fonts.js
+++ b/src/core/fonts.js
@@ -54,6 +54,7 @@ import {
   getSupplementalGlyphMapForArialBlack,
   getSupplementalGlyphMapForCalibri,
 } from "./standard_fonts.js";
+import { getVerticalPresentationForm, readUint32 } from "./core_utils.js";
 import { IdentityToUnicodeMap, ToUnicodeMap } from "./to_unicode_map.js";
 import { CFFFont } from "./cff_font.js";
 import { FontRendererFactory } from "./font_renderer.js";
@@ -61,7 +62,6 @@ import { getFontBasicMetrics } from "./metrics.js";
 import { GlyfTable } from "./glyf.js";
 import { IdentityCMap } from "./cmap.js";
 import { OpenTypeFileBuilder } from "./opentype_file_builder.js";
-import { readUint32 } from "./core_utils.js";
 import { Stream } from "./stream.js";
 import { Type1Font } from "./type1_font.js";
 
@@ -3366,6 +3366,13 @@ class Font {
       }
     }
 
+    if (this.missingFile && this.vertical && fontChar.length === 1) {
+      const vertical = getVerticalPresentationForm()[fontChar.charCodeAt(0)];
+      if (vertical) {
+        fontChar = unicode = String.fromCharCode(vertical);
+      }
+    }
+
     glyph = new Glyph(
       charcode,
       fontChar,
diff --git a/test/pdfs/bug1905623.pdf.link b/test/pdfs/bug1905623.pdf.link
new file mode 100644
index 00000000000000..0c249d74b4846d
--- /dev/null
+++ b/test/pdfs/bug1905623.pdf.link
@@ -0,0 +1 @@
+https://bugzilla.mozilla.org/attachment.cgi?id=9410429
diff --git a/test/test_manifest.json b/test/test_manifest.json
index a8fedcd4b13181..78c4d8f592b837 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -10113,5 +10113,15 @@
     "rounds": 1,
     "link": true,
     "type": "eq"
+  },
+  {
+    "id": "bug1905623",
+    "file": "pdfs/bug1905623.pdf",
+    "md5": "6c180a4353bda6b3cb0c693c5e5b32c4",
+    "rounds": 1,
+    "link": true,
+    "firstPage": 2,
+    "lastPage": 2,
+    "type": "eq"
   }
 ]