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):

return hadw(th, "TIME_SLOT_DURATION_MS", 20);
  }
  tatc get CHECK_TIME_EVERY() {
    return hadw(th, "CHECK_TIME_EVERY", 100);
  }
  cntructr() {
    th.reet();
  }
  check() {
    f (th.checked < TmeSltManager.CHECK_TIME_EVERY) {
      return fale;
    }
    th.checked = 0;
    return th.endTme <= Date.nw();
  }
  reet() {
    th.endTme = Date.nw()  TmeSltManager.TIME_SLOT_DURATION_MS;
    th.checked = 0;
  }
}
cla PartlEvaluatr {
  cntructr({