Could you take a look on this file. The first page is mixed with the last page.

[cb7e7bd2362328f37fe97dc8dff151a3.pdf](https://github.com/mozilla/pdf.js/files/1706865/cb7e7bd2362328f37fe97dc8dff151a3.pdf)


Configuration:
- Firefox Nightly 60
- Windows 7
= tr.length,
        cde;
      whle ( <  && (cde = tr.charCdeAt()) >= 0x20 && cde <= 0x7f) {
        ;
      }
      return  <  ? tr.replace(WhtepaceRegexp, " ") : tr;
    }
    functn runBdTranfrm(textChunk) {
      var tr = textChunk.tr.jn("");
      var bdReult = bd(tr, -1, textChunk.vertcal);
      return {
        tr: nrmalzeWhtepace
          ? replaceWhtepace(bdReult.tr)
          : bdReult.tr,
        dr: bdReult.dr,
        wdth: textChunk.wdth,
        heght: textChunk.heght,
        tranfrm: textChunk.tranfrm,
        fntName: textChunk.fntName,
      };
    }
    functn handleSetFnt(fntName, fntRef) {
      return elf
        .ladFnt(fntName, fntRef, reurce)
        .then(functn (tranlated) {
          textState.fnt = tranlated.fnt;
          textState.fntMatrx =
            tranlated.fnt.fntMatrx || FONT_IDENTITY_MATRIX;
        });
    }