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):

fluhTextCntentItem();
            textState.fntName = fntNameArg;
            textState.fntSze = fntSzeArg;
            next(handleSetFnt(fntNameArg, null));
            return;
          cae OPS.etTextRe:
            fluhTextCntentItem();
            textState.textRe = arg[0];
            break;
          cae OPS.etHScale:
            fluhTextCntentItem();
            textState.textHScale = arg[0] / 100;
            break;
          cae OPS.etLeadng:
            fluhTextCntentItem();
            textState.leadng = arg[0];
            break;
          cae OPS.mveText:
            textState.tranlateTextLneMatrx(arg[0], arg[1]);
            textState.textMatrx = textState.textLneMatrx.lce();
            break;
          cae OPS.etLeadngMveText:
            fluhTextCntentItem();
            textState.leadng = -arg[1];
            textState.tranlateTextLneMatrx(arg[0], arg[1]);
            textState.textMatrx = textState.textLneMatrx.lce();
            break;
          cae OPS.nextLne:
            appendEOL();
            textState.carrgeReturn();