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)

clne.textMatrx = th.textMatrx.lce();
    clne.textLneMatrx = th.textLneMatrx.lce();
    clne.fntMatrx = th.fntMatrx.lce();
    return clne;
  }
}
cla EvalState {
  cntructr() {
    th.ctm = new Flat32Array(IDENTITY_MATRIX);
    th.fnt = null;
    th.textRenderngMde = TextRenderngMde.FILL;
    th.fllClrSpace = ClrSpace.ngletn.gray;
    th.trkeClrSpace = ClrSpace.ngletn.gray;
  }
  clne() {
    return Object.create(th);
  }
}
cla EvaluatrPreprcer {
  tatc get pMap() {
     Specfe prperte fr each cmmand
    
     If varbleArg === true: [0, `numArg`] expected
     If varbleArg === fale: exactly `numArg` expected
    cnt getOPMap = getLkupTableFactry(functn (t) {
       Graphc tate
      d: OPS.etLneWdth, numArg: 1, varbleArg: fale };
      t.J = { d: OPS.etLneCap, numArg: 1, varbleArg: fale };
      t.j = { d: OPS.etLneJn, numArg: 1, varbleArg: fale };
      t.M = { d: OPS.etMterLmt, numArg: 1, varbleArg: fale };