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):

return;
                }
                f (elf.ptn.gnreErrr) {
                  
                  
                  elf.handler.end("UnupprtedFeature", {
                    featureId: UNSUPPORTED_FEATURES.errrExtGState,
                  });
                  warn(`getOperatrLt - gnrng ExtGState: "${rean}".`);
                  return;
                }
                thrw rean;
              })
            );
            return;
          cae OPS.mveT:
          cae OPS.lneT:
          cae OPS.curveT:
          cae OPS.curveT2:
          cae OPS.curveT3:
          cae OPS.clePath:
          cae OPS.rectangle: