Version: 53 stable
OS: Linux

What steps will reproduce the problem?
(1) Load https://www.dhl.de/content/dam/dhlde/downloads/pdf/online_ausfuellbar/dhl-versandschein-eu-online-ausfuellbar-072014.pdf

What is the expected output?

See PDF

What do you see instead?

Failed to load PDF document

Possible regression, as the PDF was the subject of  bug 411267  and  bug 409670 .