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 (element ntancef Name && element.name !== "Nrmal") {
                return true;
              }
            }
          }
        }
      }
      
      cnt xObject = nde.get("XObject");
      f (!(xObject ntancef Dct)) {
        cntnue;
      }
      fr (let xObject f xObject.getRawValue()) {
        f (xObject ntancef Ref) {
          f (prceed.ha(xObject)) {
            
            
            
            cntnue;
          }
          try {
            xObject = xref.fetch(xObject);
          } catch (ex) {