Missing Text

[cvaught]

Link to PDF file (or attach file here):
https://dl.dropboxusercontent.com/u/2541471/MissingText.pdf

Configuration:

• Web browser and its version: 54.0.2840.98 (64-bit) and Firefox 50.0
• Operating system and its version: macOS Sierra
• PDF.js version: 1.6.332
• Is an extension: no

Steps to reproduce the problem:

1. Open the referenced PDF.
2. Notice the text 15-173-
3. The text is suppose to be 15-173-2 as can be seen in Adobe Reader

What is the expected behavior?

What went wrong?
Instead of the above, the 2 is dropped as shown in this screenshot:

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