alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT Fiesta EK PDF Exploit Apr 23 2015"; flow:established,to_client; http.header; content:"Content-Disposition|3a 20|inline|3b|"; content:".pdf"; fast_pattern; pcre:"/Content-Disposition\x3a\x20[^\r\n]+filename=[a-z]{7,8}\d{2,3}\.pdf\r\n/m"; file.data; content:"PDF-"; within:500; classtype:exploit-kit; sid:2020984; rev:4; metadata:created_at 2015_04_23, confidence High, signature_severity Major, updated_at 2024_02_29;)