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 (
          (r.platform === 1 && r.encoding === 0 && r.language === 0) ||
          (r.platform === 3 && r.encoding === 1 && r.language === 0x409)
        ) {
          records.push(r);
        }
      }
      for (i = 0, ii = records.length; i < ii; i++) {
        const record = records[i];
        if (record.length <= 0) {
          continue; 
        }
        const pos = start + stringsStart + record.offset;
        if (pos + record.length > end) {
          continue; 
        }
        font.pos = pos;
        const nameIndex = record.name;
        if (record.encoding) {
          
          let str = "";
          for (let j = 0, jj = record.length; j < jj; j += 2) {
            str += String.fromCharCode(font.getUint16());
          }
          names[1][nameIndex] = str;
        } else {
          names[0][nameIndex] = font.getString(record.length);
        }
      }
      return names;