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):

const renderer = FontRendererFactory.create(this, SEAC_ANALYSIS_ENABLED);
    return shadow(this, "renderer", renderer);
  }
  exportData(extraProperties = false) {
    const exportDataProperties = extraProperties
      ? [...EXPORT_DATA_PROPERTIES, ...EXPORT_DATA_EXTRA_PROPERTIES]
      : EXPORT_DATA_PROPERTIES;
    const data = Object.create(null);
    let property, value;
    for (property of exportDataProperties) {
      value = this[property];
      
      if (value !== undefined) {
        data[property] = value;
      }
    }
    return data;
  }
  fallbackToSystemFont(properties) {