Hi,
Samuli is right. You have to install an AS Java seperately and select the usage type "Adobe Document Service" during installation. The dependencies are explained there.
After you have installed this "ADS"-system, you have to maintain connections to and from your ECC system.
It is descripbed here: http://help.sap.com/saphelp_nw73/helpdata/de/46/487f6d86360db6e10000000a1553f6/frameset.htm
Regards,
Bernd