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):

numGlyphs,
      dupFirstEntry
    ) {
      if (!header) {
        if (metrics) {
          metrics.data = null;
        }
        return;
      }
      file.pos = (file.start ? file.start : 0) + header.offset;
      file.pos += 4; 
      file.pos += 2; 
      file.pos += 2; 
      file.pos += 2; 
      file.pos += 2; 
      file.pos += 2; 
      file.pos += 2; 
      file.pos += 2; 
      file.pos += 2; 
      file.pos += 2; 
      const caretOffset = file.getUint16();
      file.pos += 8; 
      file.pos += 2; 
      let numOfMetrics = file.getUint16();
      if (caretOffset !== 0) {
        const macStyle = int16(headTable.data[44], headTable.data[45]);
        if (!(macStyle & 2)) {
          
          header.data[22] = 0;
          header.data[23] = 0;