We could use:
https://github.com/mozilla/pdf.js/blob/c3d08580627471432a6ad0b2fdb948df64126afa/src/display/api.js#L929

and look at bit 4.

The following pdf:
https://orimi.com/pdf-test.pdf
is not editable in neither Acrobat nor Edge nor Foxit and nor Okular.
`(PDF.js: ${version || "-"})`
    );
    let pdfTitle = info.Title;
    const metadataTitle = metadata?.get("dc:title");
    if (metadataTitle) {
      
      
      
      
      
      if (
        metadataTitle !== "Untitled" &&
        !/[\uFFF0-\uFFFF]/g.test(metadataTitle)
      ) {
        pdfTitle = metadataTitle;
      }
    }
    if (pdfTitle) {
      this.setTitle(
        `${pdfTitle} - ${this._contentDispositionFilename || document.title}`
      );
    } else if (this._contentDispositionFilename) {
      this.setTitle(this._contentDispositionFilename);
    }
    if (
      info.IsXFAPresent &&
      !info.IsAcroFormPresent &&
      !pdfDocument.isPureXfa
    ) {
      if (pdfDocument.loadingParams.enableXfa) {