A program or technique that takes advantage of a vulnerability to remotely access or attack a program, computer or server.
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The detection Exploit:JS/Comele.A identifies a malicious website/HTML document, and attempts to exploit a known vulnerability in order to download and run a malicious executable file on the system.
The vulnerability targeted for the exploit is related to CVE-2010-0249.
If the exploit is successfully executed, it will attempt to download malicious file from http://demo1[..]/[..].jpg and save it under %appdata%\a.exe.
The downloaded malicious binary will be executed and drop another malicious file that is detected as Trojan:W32/Agent.KOG.