Cups appends extra page with %EndDocument %%EOF to every print

I am using cups with a printer connected via samba. The Printer is a Kyocera Taskalfa 5021ci. Every print I make through cups results in a last page with only

%%EndDocument
%%EOF

on it. I've tried to debug this further and if I print with smbclient directly like this:

$smbclient -W DOMAIN -U USER //server/printer
Unable to initialize messaging context
Enter NET.CHALMERS.SE\jochens's password:
Try "help" to get a list of possible commands.
smb: \> print test.pdf
putting file test.pdf as test.pdf (1947.9 kb/s) (average 1947.9 kb/s)
smb: \>

it works without the extra page. I've tried to find the filter that adds the extra page but can not find it.