This indicates an attack attempt against a remote Code Execution vulnerability in AjaXplorer.
The vulnerability is due to how the filters for user inputs fail to properly sanitize the "Configdir" parameter value that is passed to "awstats.pl". An attacker may include arbitrary shell commands by supplying an injection string through the URL.
AjaXplorer version older than 2.6
System Compromise: Remote attackers can gain control of vulnerable systems
Update to latest version available from the website.