ET INFO Potential Malicious PDF (EmbeddedFiles) improper case

Query · suricata

flow:from_server,established;
content:"|0d 0a 0d 0a|%PDF";
content:"/EmbeddedFiles"; within:128; nocase;
content:!"/EmbeddedFiles"; distance:-14; within:14;
Raw source ET INFO Potential Malicious PDF (EmbeddedFiles) improper case · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET INFO Potential Malicious PDF (EmbeddedFiles) improper case";
    flow:from_server,established;
    content:"|0d 0a 0d 0a|%PDF";
    content:"/EmbeddedFiles"; within:128; nocase;
    content:!"/EmbeddedFiles"; distance:-14; within:14;
    reference:url,blog.didierstevens.com/2009/07/01/embedding-and-hiding-files-in-pdf-documents/;
    classtype:misc-activity;
    sid:2014575; rev:5;
    metadata:attack_target Client_Endpoint, created_at 2012_04_16, deployment Perimeter, confidence High, signature_severity Minor, updated_at 2023_04_20;
)

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