Add a reduced test case for issue 4379

This should have been part of PR 5136.

Based on comments https://github.com/mozilla/pdf.js/issues/4379#issuecomment-51221787 and https://github.com/mozilla/pdf.js/issues/4379#issuecomment-51475463, it should be OK to include the PDF file in the repo.
Merge pull request #5594 from Snuffleupagus/issue-4379-test

Add a reduced test case for issue 4379