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 (numOfMetrics > numGlyphs) {
        info(
          `The numOfMetrics (${numOfMetrics}) should not be ` +
            `greater than the numGlyphs (${numGlyphs}).`
        );
        
        numOfMetrics = numGlyphs;
        header.data[34] = (numOfMetrics & 0xff00) >> 8;
        header.data[35] = numOfMetrics & 0x00ff;
      }
      const numOfSidebearings = numGlyphs - numOfMetrics;
      const numMissing =
        numOfSidebearings - ((metrics.length - numOfMetrics * 4) >> 1);
      if (numMissing > 0) {
        
        
        
        const entries = new Uint8Array(metrics.length + numMissing * 2);
        entries.set(metrics.data);
        if (dupFirstEntry) {
          
          entries[metrics.length] = metrics.data[2];
          entries[metrics.length + 1] = metrics.data[3];
        }
        metrics.data = entries;
      }
    }
    function sanitizeGlyph(