Troj_Dloader.ACI is a Trojan that may be dropped by the following malware: TROJ_DROPPER.EAA

It also arrives as dropped file in %Application Data% folder using several filenames.

The intended routine of this Trojan is to download other malicious files from the Internet. However, due to errors in its code, it fails to perform its intended routine.

Technical details can be found at this Trend Micro page.