TrojanDownloader:Win32/Small.gen!AZ is a generic detection for certain malicious files that attempt to download and execute other malware in the system without the user's knowledge.
In the wild, TrojanDownloader:Win32/Small.gen!AZ
is known to be downloaded in a system by script files that may be detected as Exploit:JS/CVE-2008-0015, and which exploit a vulnerability in Microsoft Video ActiveX Control. This vulnerability is discussed in detail in Microsoft Security Advisory (972890)
Analysis by Francis Allan Tan Seng
There are no common symptoms associated with this threat. Alert notifications from installed antivirus software may be the only symptom(s).