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):

}
        
        
        forcePostTable = true;
      } else {
        
        
        
        
        
        
        
        
        
        
        for (let i = 0; i < cmapMappingsLength; ++i) {
          let charCode = cmapMappings[i].charCode;
          if (
            cmapPlatformId === 3 &&
            charCode >= 0xf000 &&
            charCode <= 0xf0ff
          ) {
            charCode &= 0xff;
          }
          charCodeToGlyphId[charCode] = cmapMappings[i].glyphId;
        }
      }
      
      if (
        properties.glyphNames &&