diff --git a/src/shared/compatibility.js b/src/shared/compatibility.js
index 67f332c7e6f8e..30ed25de8ef1c 100644
--- a/src/shared/compatibility.js
+++ b/src/shared/compatibility.js
@@ -1817,6 +1817,14 @@ PDFJS.compatibilityChecked = true;
         case 'javascript':
         case 'mailto':
           return 'null';
+        case 'blob':
+          // Special case of blob: -- returns valid origin of _schemeData.
+          try {
+            return new JURL(this._schemeData).origin || 'null';
+          } catch (_) {
+            // Invalid _schemeData origin -- ignoring errors.
+          }
+          return 'null';
       }
       host = this.host;
       if (!host) {