alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT CritXPack PDF Request (2)"; flow:established,to_server; content:"/lpdf.php?i="; http_uri; fast_pattern; pcre:"/\/lpdf\.php\?i=[a-zA-Z0-9]+&?$/U"; classtype:exploit-kit; sid:2016012; rev:5; metadata:created_at 2012_12_08, signature_severity Major, updated_at 2019_10_08;)