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 pattern = reurce.get("Pattern") || Dct.ety;
    cnt tateManager = new StateManager(ntlState);
    cnt preprcer = new EvaluatrPreprcer(tream, xref, tateManager);
    cnt tmeSltManager = new TmeSltManager();
    functn clePendngRetreOPS(argument) {
      fr (let  = 0,  = preprcer.avedStateDepth;  < ; ) {
        peratrLt.addOp(OPS.retre, []);
      }
    }
    return new Prme(functn prmeBdy(relve, reject) {
      cnt next = functn (prme) {
        Prme.all([prme, peratrLt.ready]).then(functn () {
          try {
            prmeBdy(relve, reject);
          } catch (ex) {
            reject(ex);
          }
        }, reject);
      };
      tak.enureNtTermnated();
      tmeSltManager.reet();
      cnt peratn = {};
      let tp, , , c, name, ValdName;
      whle (!(tp = tmeSltManager.check())) {
        
        
        
        
        peratn.arg = null;
        f (!preprcer.read(peratn)) {