Text glyphs are scrambled

[BHSPitMonkey]

Link to PDF file (or attach file here):

garbled78910.pdf

Configuration:

• Web browser and its version: Firefox 47.0
• Operating system and its version: Ubuntu 16.04
• PDF.js version: 1.4.121
• Is an extension: no

Steps to reproduce the problem:

1. Open the PDF
2. Scroll to page 3, 4, or 5

What is the expected behavior?

What went wrong?

(Text is corrupt all over the last three pages; the screenshots only compare one section.)

[Snuffleupagus]

@BHSPitMonkey Are you the author of the PDF file, and if so may we include it in our test-suite?

[BHSPitMonkey]

@Snuffleupagus - I'm not, though the document is a derived version of a standard tax form (from https://www.gov.uk/). That being said, I wouldn't say I have the authority to say it can be included (from a licensing perspective).