alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT DRIVEBY Nuclear EK PDF"; flow:established,from_server; file_data; content:"13 0 obj"; pcre:"/^\s*?<<\s*?\/[A-Z0-9a-z]+\([A-Z0-9a-z]+\)\s*?/Rs"; content:"/XFA[(config)17 0 R] /Fields [14 0 R]|0d 0a|>>"; classtype:exploit-kit; sid:2018363; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Any, attack_target Client_Endpoint, created_at 2014_04_04, deployment Perimeter, malware_family Nuclear, confidence High, signature_severity Critical, tag DriveBy, tag Exploit_Kit, tag Nuclear, updated_at 2019_07_26;)