This indicates an attack attempt against a denial-of-service vulnerability in the Sun Java development kit.
The vulnerability is caused by an error when the vulnerable software handles a specially crafted BMP file. It allows a remote attacker to cause a denial of service.
Sun Java development kit (jdk) before 1.5.0_11-b03
Sun Java development kit (jdk) 1.6.x
Sun Java development kit (jdk) before 1.6.0_01-b06
Denial of service
Upgrade jdk to latest verion.