This indicates an attack attempt against a Memory Corruption vulnerability in LibreOffice.
The vulnerability is caused by an error when the vulnerable software handles a malicious "rtf" file. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted "rtf" file.
LibreOffice 3.5.2 2
System Compromise: Remote attackers can gain control of vulnerable systems.
Upgrade to the latest version,available from the web site: