I believe that is a buffer overflow attempting to exploit an old rpc.statd vulnerability (for more info on the vuln see
here). As long as you are not running an extremely old and unpatched version of linux, I believe you are OK. Although it looks like that attempt failed, you should absolutely take it as a warning that someone is attempting to break into your system. You should also make sure your system is fully updated and secured, as well as look through you logs for other attempts. I'd also download and run chkrootkit and rootkit hunter, as well as verify the integrity of the packages installed on the system.
Normally it is a exceedingly bad idea to offer public access to samba/NFS shares via rpc. I'd highly recommend limiting access with a firewall. If you aren't using samba or NFS, you should turn off portmap/rpc as well as any other un-neccessary services.