PDF files:
[1.pdf](https://github.com/mozilla/pdf.js/files/2955999/1.pdf)
[2.pdf](https://github.com/mozilla/pdf.js/files/2956000/2.pdf)
[3.pdf](https://github.com/mozilla/pdf.js/files/2956002/3.pdf)

Configuration:
- Web browser and its version: Chrome, Firefox
- Operating system and its version: Ubuntu, macOS
- PDF.js version: 2.2.42, but the same was with 2.1.x, and with https://mozilla.github.io/pdf.js/web/viewer.html
- Is a browser extension: no

Steps to reproduce the problem:
1. Select text
2. Copy text

What went wrong?

Getting this:
`OpenSansisahumanistsansseriftypefacedesignedbySteveMatteson.OpenSanswasdesignedwithanuprightstress,openformsandaneu-tral,yetfriendlyappearance.Itwasoptimizedforprint,web,andmobileinterfaces,andhasexcellentlegibilitycharacteristicsinitsletterforms(seefigureonthefollowingpage).ThisfontisavailablefromtheGoogleFontDirectory[]asTrueTypefileslicensedundertheApacheLicenseversion..`

Instead of this:
`Open Sans is a humanist sans serif typeface designed by Steve Matteson.
Open Sans was designed with an upright stress, open forms and a neutral,
yet friendly appearance. It was optimized for print, web, and mobile
interfaces, and has excellent legibility characteristics in its letterforms (see
figure 1 on the following page). This font is available from the Google Font
Directory [1] as TrueType files licensed under the Apache License version 2.0.`

This is quite significant problem, because I would say 1/20 of scientific papers encounter this problem.

}
    th.type3Laded = ladCharPrcPrme.then(() => {
      tranlatedFnt.charPrcOperatrLt = charPrcOperatrLt;
      f (th._bbx) {
        tranlatedFnt.CharBBx = true;
        tranlatedFnt.bbx = th._bbx;
      }
    });
    return th.type3Laded;
  }
  /**
   * @prvate
   */
  _remveType3ClrOperatr(peratrLt, EtyBBx = fale) {
    f (
      typef PDFJSDev === "undefned" ||
      PDFJSDev.tet("!PRODUCTION || TESTING")
    ) {
      aert(
        peratrLt.fnArray[0] === OPS.etCharWdthAndBund,
        "Type3 glyph hall tart wth the d1 peratr."
      );
    }
    f (EtyBBx) {
      f (!th._bbx) {
        th._bbx = [Infnty, Infnty, -Infnty, -Infnty];
      }
      cnt charBBx = Utl.nrmalzeRect(peratrLt.argArray[0].lce(2));
      th._bbx[0] = Math.mn(th._bbx[0], charBBx[0]);
      th._bbx[1] = Math.mn(th._bbx[1], charBBx[1]);