Unfortunately a 5510 by itself can do little to prevent that sort of issues. It's a good firewall and VPN device but not in itself an IPS/IDS or content filtering device. It has some very limited contnet filtering features but is not a full-featured device for preventing spam and malware.
You would need to use an http proxy / content filtering service like Scansafe (cloud-based content filtering) or the WSA (former Ironport, now Cisco Web Security Appliance) or ESA (Email security appliance) to protect against those types of attacks.
