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):

loca,
      glyf,
      numGlyphs,
      isGlyphLocationsLong,
      hintsValid,
      dupFirstEntry,
      maxSizeOfInstructions
    ) {
      let itemSize, itemDecode, itemEncode;
      if (isGlyphLocationsLong) {
        itemSize = 4;
        itemDecode = function fontItemDecodeLong(data, offset) {
          return (
            (data[offset] << 24) |
            (data[offset + 1] << 16) |
            (data[offset + 2] << 8) |
            data[offset + 3]
          );
        };
        itemEncode = function fontItemEncodeLong(data, offset, value) {
          data[offset] = (value >>> 24) & 0xff;
          data[offset + 1] = (value >> 16) & 0xff;