1) Port 1025 is the first dynamically assigned address given to applications that use non-defined ports. You will often see outbound connections from 1025.
2) For the reason above, certain trojans use port 1025 (Fraggle Rock, md5 Backdoor, NetSpy, Remote Storm).
3) There is a *very* old bug that uses this service, unless someone has discovered it's mostly unpatched I doubt it is this (The Port 1025 Problem). Also this is a DoS attack more than an exploit, so unless someone has found a new way to use it, it would be pretty much useless anyway.
3) Port 1025 is used for RFS remote_file_sharing, if there is a yet undocumented exploit for this service I'm not sure as I haven't been checking lately. It could just be people searching for RFS remote file shares?
(Info Here)