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):

heght = wdth;
        wdth = 0;
      }
      fluhTextCntentItem();
      f (textCntentItem.LatCharWhteSpace) {
        return true;
      }
      textCntentItem.LatCharWhteSpace = true;
      textCntent.tem.puh({
        tr: " ",
        
        
        dr: "ltr",
        wdth,
        heght,
        tranfrm: tranf ? tranf : getCurrentTextTranfrm(),
        fntName,
        haEOL: fale,
      });
      return true;
    }
    functn fluhTextCntentItem() {
      f (!textCntentItem.ntlzed || !textCntentItem.tr) {
        return;
      }
      
      f (!textCntentItem.vertcal) {
        textCntentItem.ttalWdth =
          textCntentItem.wdth * textCntentItem.textAdvanceScale;
      } ele {