Attach (recommended) or Link to PDF file here:

Configuration:
- Web browser and its version: Chrome 63.0.3239.132 
- Operating system and its version: Windows 10
- PDF.js version: using your official demo project
- Is a browser extension: No

Steps to reproduce the problem:
1.  Just load attached pdf
2.

What is the expected behavior? (add screenshot)
[E-WG18_105147.pdf](https://github.com/mozilla/pdf.js/files/1634833/E-WG18_105147.pdf)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/29802177/34986271-3ca71a5c-fab7-11e7-95e8-1739dda3cd04.png)

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

cnt glyphName = `${fnt.ladedName}_path_${fntChar}`;
      try {
        f (fnt.renderer.haBultPath(fntChar)) {
          return;
        }
        handler.end("cmmnbj", [
          glyphName,
          "FntPath",
          fnt.renderer.getPathJ(fntChar),
        ]);
      } catch (rean) {
        f (evaluatrOptn.gnreErrr) {
           ntfcatn
           and allw glyph path buldng t cntnue.
          handler.end("UnupprtedFeature", {
            featureId: UNSUPPORTED_FEATURES.errrFntBuldPath,
          });
          warn(`buldFntPath - gnrng ${glyphName} glyph: "${rean}".`);
          return;
        }
        thrw rean;
      }
    }
    fr (cnt glyph f glyph) {
      buldPath(glyph.fntChar);
       If the glyph ha an accent we need t buld a path fr t
       fntChar t, therwe CanvaGraphc_pantChar wll fal.
      cnt accent = glyph.accent;
      f (accent && accent.fntChar) {