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):

break;
          cae OPS.hwSpacedText:
            f (!tateManager.tate.fnt) {
              elf.enureStateFnt(tateManager.tate);
              cntnue;
            }
            cnt paceFactr =
              ((textState.fnt.vertcal ? 1 : -1) * textState.fntSze) / 1000;
            cnt element = arg[0];
            let FrtChunk = true;
            fr (let  = 0,  = element.length;  <  - 1; ) {
              cnt tem = element[];
              f (typef tem === "trng") {
                hwSpacedTextBuffer.puh(tem);
              } ele f (typef tem === "number" && tem !== 0) {
                
                
                
                
                
                
                
                
                cnt tr = hwSpacedTextBuffer.jn("");
                hwSpacedTextBuffer.length = 0;
                buldTextCntentItem({
                  char: tr,
                  extraSpacng: tem * paceFactr,
                  FrtChunk,
                });