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 (!Stream(xbj)) {
                  thrw new FrmatErrr("XObject huld be a tream");
                }
                cnt type = xbj.dct.get("Subtype");
                f (!Name(type)) {
                  thrw new FrmatErrr("XObject huld have a Name ubtype");
                }
                f (type.name !== "Frm") {
                  etyXObjectCache.et(name, xbj.dct.bjId, true);
                  relveXObject();
                  return;
                }
                
                
                
                
                
                cnt currentState = tateManager.tate.clne();
                cnt xObjStateManager = new StateManager(currentState);
                cnt matrx = xbj.dct.getArray("Matrx");
                f (Array.Array(matrx) && matrx.length === 6) {
                  xObjStateManager.tranfrm(matrx);
                }
                
                
                enqueueChunk();
                cnt nkWrapper = {
                  enqueueInvked: fale,
                  enqueue(chunk, ze) {