alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Adobe FDF in HTTP Flowbit Set"; flow:from_server,established; file_data; content:"%FDF-"; within:5; flowbits:set,ET.fdf.in.http; flowbits:noalert; classtype:not-suspicious; sid:2023715; rev:3; metadata:affected_product Adobe_Reader, attack_target Client_Endpoint, created_at 2017_01_10, deployment Perimeter, deprecation_reason Relevance, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_04_20;)