Exploit-TaroDrop.e Trojan is a detection for malformed JustSystems Ichitaro Document files that attempts to exploit a 0-day vulnerability discovered this month. When opened in Ichitaro, it causes a buffer overflow that can lead to arbitrary code execution in the targeted system.

Japanese users of this application may find more information on the vulnerability:

http://www.justsystems.com/jp/info/pd8002.html (Japanese)

More information can be found at this McAfee page.