From ea3a2b2676192dbddf65e78e96c8981e69632855 Mon Sep 17 00:00:00 2001
From: euvre <93761161+euvre@users.noreply.github.com>
Date: Fri, 14 Aug 2026 02:08:46 -0700
Subject: [PATCH] fix(web): pass pdf.js cMap/standard font URLs so CID-font
 PDFs render in preview (#18249)

---
 web/src/components/document-preview/pdf-preview.tsx | 4 ++++
 web/vite.config.ts                                  | 8 ++++++++
 2 files changed, 12 insertions(+)

diff --git a/web/src/components/document-preview/pdf-preview.tsx b/web/src/components/document-preview/pdf-preview.tsx
index d470ad2a9f..a2d7eb1867 100644
--- a/web/src/components/document-preview/pdf-preview.tsx
+++ b/web/src/components/document-preview/pdf-preview.tsx
@@ -33,6 +33,7 @@ import { getAuthorization } from '@/utils/authorization-util';
 import { useCatchDocumentError } from './hooks';
 type PdfLoaderProps = React.ComponentProps<typeof PdfLoader> & {
   httpHeaders?: Record<string, string>;
+  standardFontDataUrl?: string;
 };
 
 const Loader = PdfLoader as React.ComponentType<PdfLoaderProps>;
@@ -100,6 +101,9 @@ const PdfPreview = ({
           </div>
         }
         workerSrc="/pdfjs-dist/pdf.worker.min.js"
+        cMapUrl="/pdfjs-dist/cmaps/"
+        cMapPacked={true}
+        standardFontDataUrl="/pdfjs-dist/standard_fonts/"
         errorMessage={<FileError>{error}</FileError>}
       >
         {(pdfDocument) => {
diff --git a/web/vite.config.ts b/web/vite.config.ts
index 3fad555d1d..3cd9b16c50 100644
--- a/web/vite.config.ts
+++ b/web/vite.config.ts
@@ -160,6 +160,14 @@ export default defineConfig(({ mode }) => {
             src: 'node_modules/monaco-editor/min/vs/',
             dest: './',
           },
+          {
+            src: 'node_modules/pdfjs-dist/cmaps/',
+            dest: 'pdfjs-dist/',
+          },
+          {
+            src: 'node_modules/pdfjs-dist/standard_fonts/',
+            dest: 'pdfjs-dist/',
+          },
         ],
       }),
       createHtmlPlugin({