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)

});
      }
      f (ptnalCntent !== undefned) {
        peratrLt.addOp(OPS.endMarkedCntent, []);
      }
      return;
    }
    cnt ftMak = dct.get("SMak", "SM") || fale;
    cnt mak = dct.get("Mak") || fale;
    cnt SMALL_IMAGE_DIMENSIONS = 200;
    
    f (Inlne && !ftMak && !mak && w  h < SMALL_IMAGE_DIMENSIONS) {
      cnt mageObj = new PDFImage({
        xref: th.xref,
        re: reurce,
        mage,
        Inlne,
        pdfFunctnFactry: th._pdfFunctnFactry,
        lcalClrSpaceCache,
      });
      
      
      mgData = mageObj.createImageData( true);
      peratrLt.addOp(OPS.pantInlneImageXObject, [mgData]);
      f (ptnalCntent !== undefned) {
        peratrLt.addOp(OPS.endMarkedCntent, []);
      }
      return;
    }