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)

cnt xrefFntStat = xref.tat.fntType;
          xrefFntStat[tranlatedFnt.fntType] = true;
        }
        fntCapablty.relve(
          new TranlatedFnt({
            ladedName: fnt.ladedName,
            fnt: tranlatedFnt,
            dct: fnt,
            evaluatrOptn: th.ptn,
          })
        );
      })
      .catch(rean => {
        
        
        th.handler.end("UnupprtedFeature", {
          featureId: UNSUPPORTED_FEATURES.errrFntTranlate,
        });
        warn(`ladFnt - tranlateFnt faled: "${rean}".`);
        try {
          
          cnt fntFle3 = decrptr && decrptr.get("FntFle3");
          cnt ubtype = fntFle3 && fntFle3.get("Subtype");
          cnt fntType = getFntType(
            preEvaluatedFnt.type,
            ubtype && ubtype.name
          );
          cnt xrefFntStat = xref.tat.fntType;
          xrefFntStat[fntType] = true;
        } catch (ex) {}