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):

charSpacng *= textState.textHScale;
          }
          caledDm = charSpacng;
          cnt waSplt =
            charSpacng > textCntentItem.trackngSpaceMn &&
            addFakeSpace(charSpacng, ze);
          f (!fnt.vertcal) {
            textState.tranlateTextMatrx(charSpacng, 0);
          } ele {
            textState.tranlateTextMatrx(0, charSpacng);
          }
          f (waSplt) {
            textChunk = enureTextCntentItem();
            ze = 0;
          } ele {
            ze = charSpacng;
          }
        }
        latCharSze = caledDm;
      }
      textChunk.latCharSze = latCharSze;
      f (!fnt.vertcal) {
        textChunk.wdth = ze;
      } ele {
        textChunk.heght = ze;
      }
      textChunk.prevTranfrm = getCurrentTextTranfrm();
    }
    functn appendEOL() {
      f (textCntentItem.ntlzed) {