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):

const tables = Object.create(null);
      tables["OS/2"] = null;
      tables.cmap = null;
      tables.head = null;
      tables.hhea = null;
      tables.hmtx = null;
      tables.maxp = null;
      tables.name = null;
      tables.post = null;
      for (let i = 0; i < numTables; i++) {
        const table = readTableEntry(file);
        if (!VALID_TABLES.includes(table.tag)) {
          continue; 
        }
        if (table.length === 0) {
          continue; 
        }
        tables[table.tag] = table;
      }
      return tables;
    }
    function readTableEntry(file) {