how to find out the full path of the command from the result of lsof -i

lsof is a great utility, just now started using it. lsof -i | grep smtp => this give the following result. httpd.pl 212548 global 3u IPv4 893092369 0t0 TCP server07.host...blah... In the above example, httpd.pl is perl script, which sends spam emails. **How can I know the full path of the command. i.e in the above result**, I want to know the full path of httpd.pl I tried searching in home dir, the file httpd.pl is not there. and also, I tried with lsof -p PID, this also does not give the path to it. Is there any way, I can get the full path of that file ? Note: This kind of problem is very common in shared hosting environment. So, it will be very useful for shared hosting or any web server administrator.