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):

data[offset + 2] = (value >> 8) & 0xff;
          data[offset + 3] = value & 0xff;
        };
      } else {
        itemSize = 2;
        itemDecode = function fontItemDecode(data, offset) {
          return (data[offset] << 9) | (data[offset + 1] << 1);
        };
        itemEncode = function fontItemEncode(data, offset, value) {
          data[offset] = (value >> 9) & 0xff;
          data[offset + 1] = (value >> 1) & 0xff;
        };
      }
      
      const numGlyphsOut = dupFirstEntry ? numGlyphs + 1 : numGlyphs;
      const locaDataSize = itemSize * (1 + numGlyphsOut);
      
      const locaData = new Uint8Array(locaDataSize);
      locaData.set(loca.data.subarray(0, locaDataSize));
      loca.data = locaData;
      
      const oldGlyfData = glyf.data;
      const oldGlyfDataLength = oldGlyfData.length;
      const newGlyfData = new Uint8Array(oldGlyfDataLength);
      
      
      
      
      
      let i, j;