This indicates an attack attempt against a buffer overflow vulnerability in ESET SMART Security and NOD32 Antivirus.
The vulnerability is due to a failure by the application to do sufficient boundary checks on user supplied inputs. It allows a remote attacker to execute arbitrary code via sending a malformed .LZH file.
ESET Smart Security 4.2 and NOD32 Antivirus 4.2
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.