diff --git a/src/shared/compatibility.js b/src/shared/compatibility.js
index 10a2065c0fe62a..5723d6d39113c6 100644
--- a/src/shared/compatibility.js
+++ b/src/shared/compatibility.js
@@ -1812,6 +1812,14 @@ PDFJS.compatibilityChecked = true;
         case 'javascript':
         case 'mailto':
           return 'null';
+        case 'blob':
+          // Special case of blob: -- returns valid origin of _schemaData.
+          try {
+            return new JURL(this._schemeData).origin || 'null';
+          } catch (_) {
+            // Invalid _schemaData origin -- ignoring errors.
+          }
+          return 'null';
       }
       host = this.host;
       if (!host) {