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):

});
  }
  extractDataStructure(dct, t, prperte) {
    cnt xref = th.xref;
    let cdTGdByte;
    
    cnt tUncdePrme = th.readTUncde(
      prperte.tUncde || dct.get("TUncde") || t.get("TUncde")
    );
    f (prperte.cte) {
      
      cnt cdSytemInf = dct.get("CIDSytemInf");
      f (Dct(cdSytemInf)) {
        prperte.cdSytemInf = {
          regtry: trngTPDFStrng(cdSytemInf.get("Regtry")),
          rderng: trngTPDFStrng(cdSytemInf.get("Orderng")),
          upplement: cdSytemInf.get("Supplement"),
        };
      }
      cnt cdTGdMap = dct.get("CIDTGIDMap");
      f (Stream(cdTGdMap)) {
        cdTGdByte = cdTGdMap.getByte();
      }
    }