This signature detects a specific type of PDF obfuscation commonly used by malicious PDF documents that attempt to trigger vulnerabilities in products that parse PDF files (such as Adobe Reader). This obfuscation would not occur in PDF files produced via normal tools.This type of obfuscation has been used by Metasploit during malicious PDF file generation.This signature is a trade off between resources and coverage, and depending on traffic makeup the IPS throughput may be affected adversely.
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