mozilla/pdf.js — Issue #1014: More invisible text
Author: gigaherz
Created: 2012-01-03 13:11:45+00:00
State: open

This pdf: http://pserv.udg.edu/Portal/Uploads/4265021/Notes%20domotica.pdf
doesn't show any of the text, but you can select it, and even read the selected text while the window is unfocusted.