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):

isTrueType
    ) {
      const { scaleFactors } = properties;
      const isGlyphLocationsLong = int16(
        tables.head.data[50],
        tables.head.data[51]
      );
      const glyphs = new GlyfTable({
        glyfTable: tables.glyf.data,
        isGlyphLocationsLong,
        locaTable: tables.loca.data,
        numGlyphs,
      });
      glyphs.scale(scaleFactors);
      const { glyf, loca, isLocationLong } = glyphs.write();
      tables.glyf.data = glyf;
      tables.loca.data = loca;
      if (isLocationLong !== !!isGlyphLocationsLong) {
        tables.head.data[50] = 0;
        tables.head.data[51] = isLocationLong ? 1 : 0;
      }
      const metrics = tables.hmtx.data;
      for (let i = 0; i < numGlyphs; i++) {
        const j = 4 * i;
        const advanceWidth = Math.round(
          scaleFactors[i] * int16(metrics[j], metrics[j + 1])
        );
        metrics[j] = (advanceWidth >> 8) & 0xff;
        metrics[j + 1] = advanceWidth & 0xff;
        const lsb = Math.round(