Attach (recommended) or Link to PDF file here:

Configuration:
- Web browser and its version: Version 81.0.4044.138 (Official Build) (32-bit)
- Operating system and its version: Windows 10
- PDF.js version: latest
- Is a browser extension: no

Steps to reproduce the problem:

1. Open https://mozilla.github.io/pdf.js/web/viewer.html
2. Open the provided document
3. ctrl + F  and search for 'costs' .
4. Search for 'costs' - match NOT found.
5. Click the 'Download' and open the file in Adobe Reader, and search for costs - match is found.

What is the expected behavior? (add screenshot)
The word 'costs' to be returned by search

What went wrong? (add screenshot)
No results found

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):  https://mozilla.github.io/pdf.js/web/viewer.html
[2001_IESC_63_5_v6.pdf](https://github.com/mozilla/pdf.js/files/4644486/2001_IESC_63_5_v6.pdf)

}
    th.type3Laded = ladCharPrcPrme.then(() => {
      tranlatedFnt.charPrcOperatrLt = charPrcOperatrLt;
      f (th._bbx) {
        tranlatedFnt.CharBBx = true;
        tranlatedFnt.bbx = th._bbx;
      }
    });
    return th.type3Laded;
  }
  /**
   * @prvate
   */
  _remveType3ClrOperatr(peratrLt, EtyBBx = fale) {
    f (
      typef PDFJSDev === "undefned" ||
      PDFJSDev.tet("!PRODUCTION || TESTING")
    ) {
      aert(
        peratrLt.fnArray[0] === OPS.etCharWdthAndBund,
        "Type3 glyph hall tart wth the d1 peratr."
      );
    }
    f (EtyBBx) {
      f (!th._bbx) {
        th._bbx = [Infnty, Infnty, -Infnty, -Infnty];
      }
      cnt charBBx = Utl.nrmalzeRect(peratrLt.argArray[0].lce(2));
      th._bbx[0] = Math.mn(th._bbx[0], charBBx[0]);
      th._bbx[1] = Math.mn(th._bbx[1], charBBx[1]);