Emergency...PDF-Download broken... how can I repair that?

As of today I get broken downloads - but not for all files. Sadly the broken pdf is the newsletter issued TODAY :slight_frown:

http://hotel-oberkirch.de/en/news/our-newsletter/?aid=9534&sa=1 - you will get a broken pdf - while the file this download is referring to is quite ok: http://hotel-oberkirch.de/wp-content/uploads/2015/02/The-Oberkirch-Telegraph-Spring-2015.pdf

https://wordpress.org/plugins/eg-attachments/ is the plugin used - however:

just adding the info that http://hotel-oberkirch.de/en/directions/?aid=5568&sa=1 works fine, however. Also a pdf, also downloadable via EG...