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):

properties,
          SEAC_ANALYSIS_ENABLED
        );
        cff = parser.parse();
        cff.duplicateFirstGlyph();
        const compiler = new CFFCompiler(cff);
        tables["CFF "].data = compiler.compile();
      } catch (e) {
        warn("Failed to compile font " + properties.loadedName);
      }
    }
    
    if (!tables.name) {
      tables.name = {
        tag: "name",
        data: createNameTable(this.name),
      };
    } else {
      
      const namePrototype = readNameTable(tables.name);
      tables.name.data = createNameTable(name, namePrototype);
      this.psName = namePrototype[0][6] || null;
    }
    const builder = new OpenTypeFileBuilder(header.version);
    for (const tableTag in tables) {
      builder.addTable(tableTag, tables[tableTag].data);
    }
    return builder.toArray();
  }
  convert(fontName, font, properties) {