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Using NetWitness to detect malicious PDFs and overcoming obfuscation

Question asked by RSA Admin Employee on Aug 20, 2013
Latest reply on Aug 22, 2013 by SeffyGHops

Hi all,

 

I am putting together some procedures for detecting a malicious PDF using Netwitness.


So far I have gathered that it is fairly easy to search sessions for common indicators such as embedded JavaScript, Flash and actions such as OpenAction or /URI.

 

I am aware however that the PDF standard makes it very easy to obfuscate malicious content embedded in PDFs, particularly via the following methods:

 

  • String splitting across multiple lines using parenthesis and backslashes
  • Switching characters for octal or hexadecimal representations
  • Whitespacing between hex characters

 

I am finding it difficult to work out a way (Other then manual investigation) that NW can be used to automate the process of detected malicious PDFs using drills and searches and I was just wondering if anyone had any experience using Netwitness to detect malicious PDFs or any ideas how to overcome common obfuscation attempts?

 

Thanks in advance!

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