diff --git a/web/app.js b/web/app.js
index 058d31ce9bbcf..1dfb6e66c9eb0 100644
--- a/web/app.js
+++ b/web/app.js
@@ -3279,12 +3279,14 @@ function webViewerPostMessage(evt) {
           PDFViewerApplication.open({
             data: atob(data.data),
             originalUrl: data.name,
+            filename: data.name ? `${data.name}.pdf` : "liker-land_ebook.pdf",
           });
           break;
         case "openArrayBufferFile":
           PDFViewerApplication.open({
             data: new Uint8Array(data.data),
             originalUrl: data.name,
+            filename: data.name ? `${data.name}.pdf` : "liker-land_ebook.pdf",
           });
           break;
       }