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)

function (data) {
          expect(data instanceof PasswordException).toEqual(true);
          expect(data.code).toEqual(PasswordResponses.INCORRECT_PASSWORD);
          return passwordIncorrectLoadingTask.destroy();
        }
      );
      const passwordAcceptedLoadingTask = getDocument(
        buildGetDocumentParams(filename, {
          password: "asdfasdf",
        })
      );
      expect(
        passwordAcceptedLoadingTask instanceof PDFDocumentLoadingTask
      ).toEqual(true);
      const result3 = passwordAcceptedLoadingTask.promise.then(function (data) {
        expect(data instanceof PDFDocumentProxy).toEqual(true);
        return passwordAcceptedLoadingTask.destroy();
      });
      await Promise.all([result1, result2, result3]);
    });
    it(
      "creates pdf doc from password protected PDF file and aborts/throws " +
        "in the onPassword callback (issue 7806)",
      async function () {
        const filename = "issue3371.pdf";
        const passwordNeededLoadingTask = getDocument(
          buildGetDocumentParams(filename)
        );
        expect(
          passwordNeededLoadingTask instanceof PDFDocumentLoadingTask