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):

tables.maxp.data[5] = numGlyphsOut & 255;
    const hintsValid = sanitizeTTPrograms(
      tables.fpgm,
      tables.prep,
      tables["cvt "],
      maxFunctionDefs
    );
    if (!hintsValid) {
      delete tables.fpgm;
      delete tables.prep;
      delete tables["cvt "];
    }
    
    
    sanitizeMetrics(
      font,
      tables.hhea,
      tables.hmtx,
      tables.head,
      numGlyphsOut,
      dupFirstEntry
    );
    if (!tables.head) {
      throw new FormatError('Required "head" table is not found');
    }
    sanitizeHead(tables.head, numGlyphs, isTrueType ? tables.loca.length : 0);
    let missingGlyphs = Object.create(null);
    if (isTrueType) {
      const isGlyphLocationsLong = int16(
        tables.head.data[50],