Trying to open the file `Profit_Projektvorschlag_R.pdf` fails with the error message at the bottom.

$ wget http://www.ibb.de/portaldata/1/resources/content/download/WiFoe/Profit_Projektvorschlag_R.pdf
--2014-08-12 16:18:23--  http://www.ibb.de/portaldata/1/resources/content/download/WiFoe/Profit_Projektvorschlag_R.pdf
Auflösen des Hostnamen »www.ibb.de (www.ibb.de)«... 213.61.227.181
Verbindungsaufbau zu www.ibb.de (www.ibb.de)|213.61.227.181|:80... verbunden.
HTTP-Anforderung gesendet, warte auf Antwort... 200 OK
Länge: 2278152 (2,2M) [application/pdf]
In »»Profit_Projektvorschlag_R.pdf«« speichern.

100%[===================================================================================================================================================================================================================================================================================>] 2.278.152    395K/s   in 5,4s    

2014-08-12 16:18:28 (409 KB/s) - »»Profit_Projektvorschlag_R.pdf«« gespeichert [2278152/2278152]
$ file Profit_Projektvorschlag_R.pdf
Profit_Projektvorschlag_R.pdf: PDF document, version 1.6

The following error is shown.

Pleas wait...
If this message is not eventually replaced by the proper contents of the document, your PDF
viewer may not be able to display this type of document.
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The Mac OSX PDF program has the same problem. Opening it with the Adobe Reader works.