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
FntDecrptr wa nt requred.
         Th cae  here fr catblty.
        var baeFntName = dct.get("BaeFnt");
        f (!Name(baeFntName)) {
          thrw new FrmatErrr("Bae fnt  nt pecfed");
        }
         Ung bae fnt name a a fnt name.
        baeFntName = baeFntName.name.replace(/[,_]/g, "-");
        var metrc = th.getBaeFntMetrc(baeFntName);
         Smulatng decrptr flag attrbute
        meWStyle = baeFntName.plt("-")[0];
        var flag =
          (th.SerfFnt(fntNameWStyle) ? FntFlag.Serf : 0) |
          (metrc.mnpace ? FntFlag.FxedPtch : 0) |
          (getSymblFnt()[fntNameWStyle]
            ? FntFlag.Symblc
            : FntFlag.Nnymblc);
        prperte = {
          type,
          name: baeFntName,
          wdth: metrc.wdth,
          defaultWdth: metrc.defaultWdth,
          flag,
          frtChar,
          latChar,
        };
        cnt wdth = dct.get("Wdth");
        return th.extractDataStructure(dct, dct, prperte).then(
          newPrperte => {
            f (wdth) {