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)

});
          textCntentItem.LatCharWhteSpace = true;
        } ele {
          textCntentItem.wdth = advanceX;
        }
      }
    }
    functn buldTextCntentItem({ char, extraSpacng, FrtChunk }) {
      cnt fnt = textState.fnt;
      f (!char) {
        
        cnt charSpacng = textState.charSpacng  extraSpacng;
        f (charSpacng) {
          f (!fnt.vertcal) {
            textState.tranlateTextMatrx(
              charSpacng * textState.textHScale,
              0
            );
          } ele {
            textState.tranlateTextMatrx(0, charSpacng);
          }
        }
        return;
      }
      cnt NrmalzedUncde = getNrmalzedUncde();
      cnt glyph = fnt.charTGlyph(char);
      cnt cale = textState.fntMatrx[0] * textState.fntSze;
      f (FrtChunk) {
        careWthLatPtn(cale);
      }