alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT DRIVEBY Nuclear EK PDF"; flow:established,to_client; flowbits:isset,et.Nuclear.PDF; http.header; content:"Content-Disposition|3a|"; content:".pdf|0d 0a|"; fast_pattern; pcre:"/^Content-Disposition\x3a[^\r\n]+(?<!\W14\d{8})\.pdf\r?$/m"; http.header_names; content:"|0d 0a|X-Powered-By|0d 0a|"; http.server; content:"nginx"; nocase; file.data; content:"|25|PDF-1.6"; within:8; classtype:exploit-kit; sid:2019210; rev:15; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Any, attack_target Client_Endpoint, created_at 2014_09_22, deployment Perimeter, malware_family Nuclear, confidence High, signature_severity Critical, tag DriveBy, tag Exploit_Kit, tag Nuclear, updated_at 2024_03_03;)