diff --git a/web/app.js b/web/app.js
index 90c492dfd..caf3ac1a4 100644
--- a/web/app.js
+++ b/web/app.js
@@ -561,7 +561,10 @@ const PDFViewerApplication = {
       appConfig.documentProperties,
       this.overlayManager,
       eventBus,
-      this.l10n
+      this.l10n,
+      /* fileNameLookup = */ () => {
+        return this._docFilename;
+      }
     );
 
     this.pdfCursorTools = new PDFCursorTools({
@@ -1194,7 +1197,7 @@ const PDFViewerApplication = {
       baseDocumentUrl = location.href.split("#")[0];
     }
     this.pdfLinkService.setDocument(pdfDocument, baseDocumentUrl);
-    this.pdfDocumentProperties.setDocument(pdfDocument, this.url);
+    this.pdfDocumentProperties.setDocument(pdfDocument);
 
     const pdfViewer = this.pdfViewer;
     pdfViewer.setDocument(pdfDocument);
@@ -1515,16 +1518,15 @@ const PDFViewerApplication = {
         `${(info.Producer || "-").trim()} / ${(info.Creator || "-").trim()}] ` +
         `(PDF.js: ${version || "-"})`
     );
-    let pdfTitle = info?.Title;
+    let pdfTitle = info.Title;
 
     const metadataTitle = metadata?.get("dc:title");
     if (metadataTitle) {
       // Ghostscript can produce invalid 'dc:title' Metadata entries:
       //  - The title may be "Untitled" (fixes bug 1031612).
       //  - The title may contain incorrectly encoded characters, which thus
-      //    looks broken, hence we ignore the Metadata entry when it
-      //    contains characters from the Specials Unicode block
-      //    (fixes bug 1605526).
+      //    looks broken, hence we ignore the Metadata entry when it contains
+      //    characters from the Specials Unicode block (fixes bug 1605526).
       if (
         metadataTitle !== "Untitled" &&
         !/[\uFFF0-\uFFFF]/g.test(metadataTitle)
@@ -1534,10 +1536,10 @@ const PDFViewerApplication = {
     }
     if (pdfTitle) {
       this.setTitle(
-        `${pdfTitle} - ${contentDispositionFilename || document.title}`
+        `${pdfTitle} - ${this._contentDispositionFilename || document.title}`
       );
-    } else if (contentDispositionFilename) {
-      this.setTitle(contentDispositionFilename);
+    } else if (this._contentDispositionFilename) {
+      this.setTitle(this._contentDispositionFilename);
     }
 
     if (
diff --git a/web/pdf_document_properties.js b/web/pdf_document_properties.js
index 727013b58..8761b08d6 100644
--- a/web/pdf_document_properties.js
+++ b/web/pdf_document_properties.js
@@ -13,11 +13,7 @@
  * limitations under the License.
  */
 
-import {
-  createPromiseCapability,
-  getPdfFilenameFromUrl,
-  PDFDateString,
-} from "pdfjs-lib";
+import { createPromiseCapability, PDFDateString } from "pdfjs-lib";
 import { getPageSizeInches, isPortraitOrientation } from "./ui_utils.js";
 
 const DEFAULT_FIELD_CONTENT = "-";
@@ -58,12 +54,21 @@ class PDFDocumentProperties {
    * @param {OverlayManager} overlayManager - Manager for the viewer overlays.
    * @param {EventBus} eventBus - The application event bus.
    * @param {IL10n} l10n - Localization service.
+   * @param {function} fileNameLookup - The function that is used to lookup
+   *   the document fileName.
    */
-  constructor({ dialog, fields, closeButton }, overlayManager, eventBus, l10n) {
+  constructor(
+    { dialog, fields, closeButton },
+    overlayManager,
+    eventBus,
+    l10n,
+    fileNameLookup
+  ) {
     this.dialog = dialog;
     this.fields = fields;
     this.overlayManager = overlayManager;
     this.l10n = l10n;
+    this._fileNameLookup = fileNameLookup;
 
     this.#reset();
     // Bind the event listener for the Close button.
@@ -110,7 +115,7 @@ class PDFDocumentProperties {
     const {
       info,
       /* metadata, */
-      contentDispositionFilename,
+      /* contentDispositionFilename, */
       contentLength,
     } = await this.pdfDocument.getMetadata();
 
@@ -122,7 +127,7 @@ class PDFDocumentProperties {
       pageSize,
       isLinearized,
     ] = await Promise.all([
-      contentDispositionFilename || getPdfFilenameFromUrl(this.url),
+      this._fileNameLookup(),
       this.#parseFileSize(contentLength),
       this.#parseDate(info.CreationDate),
       this.#parseDate(info.ModDate),
@@ -173,15 +178,13 @@ class PDFDocumentProperties {
   }
 
   /**
-   * Set a reference to the PDF document and the URL in order
-   * to populate the overlay fields with the document properties.
-   * Note that the overlay will contain no information if this method
-   * is not called.
+   * Set a reference to the PDF document in order to populate the dialog fields
+   * with the document properties. Note that the dialog will contain no
+   * information if this method is not called.
    *
    * @param {PDFDocumentProxy} pdfDocument - A reference to the PDF document.
-   * @param {string} url - The URL of the document.
    */
-  setDocument(pdfDocument, url = null) {
+  setDocument(pdfDocument) {
     if (this.pdfDocument) {
       this.#reset();
       this.#updateUI(true);
@@ -190,14 +193,12 @@ class PDFDocumentProperties {
       return;
     }
     this.pdfDocument = pdfDocument;
-    this.url = url;
 
     this._dataAvailableCapability.resolve();
   }
 
   #reset() {
     this.pdfDocument = null;
-    this.url = null;
 
     this.#fieldData = null;
     this._dataAvailableCapability = createPromiseCapability();