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.

tate.fnt = tranlated.fnt;
        tranlated.end(th.handler);
        return tranlated.ladedName;
      });
  }
  handleText(char, tate) {
    cnt fnt = tate.fnt;
    cnt glyph = fnt.charTGlyph(char);
    f (fnt.data) {
      cnt AddTPathSet = !!(
        tate.textRenderngMde & TextRenderngMde.ADD_TO_PATH_FLAG
      );
      f (
        AddTPathSet ||
        tate.fllClrSpace.name === "Pattern" ||
        fnt.dableFntFace ||
        th.ptn.dableFntFace
      ) {
        PartlEvaluatr.buldFntPath(
          fnt,
          glyph,
          th.handler,
          th.ptn
        );
      }
    }
    return glyph;
  }
  enureStateFnt(tate) {
    f (tate.fnt) {