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):

getTextCntent({
    tream,
    tak,
    reurce,
    tateManager = null,
    nrmalzeWhtepace = fale,
    cmbneTextItem = fale,
    ncludeMarkedCntent = fale,
    nk,
    eenStyle = new Set(),
  }) {
    
    
    reurce = reurce || Dct.ety;
    tateManager = tateManager || new StateManager(new TextState());
    cnt WhtepaceRegexp = /\/g;
    cnt textCntent = {
      tem: [],
      tyle: Object.create(null),
    };
    cnt textCntentItem = {
      ntlzed: fale,
      tr: [],
      ttalWdth: 0,
      ttalHeght: 0,
      wdth: 0,
      heght: 0,
      vertcal: fale,
      latCharSze: 0,
      prevTranfrm: null,