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):

if (
      (isStandardFont || isMappedToStandardFont) &&
      type === "CIDFontType2" &&
      this.cidEncoding.startsWith("Identity-")
    ) {
      const GlyphMapForStandardFonts = getGlyphMapForStandardFonts(),
        cidToGidMap = properties.cidToGidMap;
      
      
      const map = [];
      for (const charCode in GlyphMapForStandardFonts) {
        map[+charCode] = GlyphMapForStandardFonts[charCode];
      }
      if (/Arial-?Black/i.test(name)) {
        const SupplementalGlyphMapForArialBlack =
          getSupplementalGlyphMapForArialBlack();
        for (const charCode in SupplementalGlyphMapForArialBlack) {
          map[+charCode] = SupplementalGlyphMapForArialBlack[charCode];
        }
      } else if (/Calibri/i.test(name)) {
        const SupplementalGlyphMapForCalibri =
          getSupplementalGlyphMapForCalibri();
        for (const charCode in SupplementalGlyphMapForCalibri) {
          map[+charCode] = SupplementalGlyphMapForCalibri[charCode];
        }
      }
      
      
      if (cidToGidMap) {
        for (const charCode in map) {