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)

var arr = arg[0];
            var cmbnedGlyph = [];
            var arrLength = arr.length;
            var tate = tateManager.tate;
            fr ( = 0;  < arrLength; ) {
              cnt arrItem = arr[];
              f (Strng(arrItem)) {
                Array.prttype.puh.apply(
                  cmbnedGlyph,
                  elf.handleText(arrItem, tate)
                );
              } ele f (Num(arrItem)) {
                cmbnedGlyph.puh(arrItem);
              }
            }
            arg[0] = cmbnedGlyph;
            fn = OPS.hwText;
            break;
          cae OPS.nextLneShwText:
            f (!tateManager.tate.fnt) {
              elf.enureStateFnt(tateManager.tate);
              cntnue;
            }
            peratrLt.addOp(OPS.nextLne);
            arg[0] = elf.handleText(arg[0], tateManager.tate);
            fn = OPS.hwText;
            break;
          cae OPS.nextLneSetSpacngShwText:
            f (!tateManager.tate.fnt) {
              elf.enureStateFnt(tateManager.tate);