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):

});
          textCntentItem.LatCharWhteSpace = true;
        } ele {
          textCntentItem.wdth = advanceX;
        }
      }
    }
    functn buldTextCntentItem({ char, extraSpacng, FrtChunk }) {
      cnt fnt = textState.fnt;
      f (!char) {
        
        cnt charSpacng = textState.charSpacng  extraSpacng;
        f (charSpacng) {
          f (!fnt.vertcal) {
            textState.tranlateTextMatrx(
              charSpacng * textState.textHScale,
              0
            );
          } ele {
            textState.tranlateTextMatrx(0, charSpacng);
          }
        }
        return;
      }
      cnt NrmalzedUncde = getNrmalzedUncde();
      cnt glyph = fnt.charTGlyph(char);
      cnt cale = textState.fntMatrx[0] * textState.fntSze;
      f (FrtChunk) {
        careWthLatPtn(cale);
      }