Attach (recommended) or Link to PDF file here: [ar99.pdf](https://github.com/mozilla/pdf.js/files/7086733/ar99.pdf)
https://www.dallasfed.org/fed/~/media/documents/fed/annual/1999/ar99.pdf 

Configuration:
- Web browser and its version: Firefox Browser 72.0.2 (64-bit)
- Operating system and its version: Windows 10 Enterprise version 1809
- PDF.js version: 2.4.152
- Is a browser extension:

Steps to reproduce the problem:
1. Open URL
2. Observe

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/60226822/72994265-6a03c780-3dbc-11ea-8914-42563b321546.png)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/60226822/72994291-77b94d00-3dbc-11ea-9de2-6214a4d4b361.png)

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

const getStdFontMap = getLookupTableFactory(function (t) {
  
  t["Times-Roman"] = "Times-Roman";
  t.Helvetica = "Helvetica";
  t.Courier = "Courier";
  t.Symbol = "Symbol";
  t["Times-Bold"] = "Times-Bold";
  t["Helvetica-Bold"] = "Helvetica-Bold";
  t["Courier-Bold"] = "Courier-Bold";
  t.ZapfDingbats = "ZapfDingbats";
  t["Times-Italic"] = "Times-Italic";
  t["Helvetica-Oblique"] = "Helvetica-Oblique";
  t["Courier-Oblique"] = "Courier-Oblique";
  t["Times-BoldItalic"] = "Times-BoldItalic";
  t["Helvetica-BoldOblique"] = "Helvetica-BoldOblique";
  t["Courier-BoldOblique"] = "Courier-BoldOblique";
  
  t.ArialNarrow = "Helvetica";
  t["ArialNarrow-Bold"] = "Helvetica-Bold";
  t["ArialNarrow-BoldItalic"] = "Helvetica-BoldOblique";
  t["ArialNarrow-Italic"] = "Helvetica-Oblique";
  t.ArialBlack = "Helvetica";
  t["ArialBlack-Bold"] = "Helvetica-Bold";
  t["ArialBlack-BoldItalic"] = "Helvetica-BoldOblique";
  t["ArialBlack-Italic"] = "Helvetica-Oblique";
  t["Arial-Black"] = "Helvetica";
  t["Arial-Black-Bold"] = "Helvetica-Bold";
  t["Arial-Black-BoldItalic"] = "Helvetica-BoldOblique";
  t["Arial-Black-Italic"] = "Helvetica-Oblique";
  t.Arial = "Helvetica";