Static detection of malicious JavaScript-bearing PDF documents

  • Authors:
  • Pavel Laskov;Nedim Šrndić

  • Affiliations:
  • University of Tübingen, Sand, Tübingen, Germany;University of Tübingen, Sand, Tübingen, Germany

  • Venue:
  • Proceedings of the 27th Annual Computer Security Applications Conference
  • Year:
  • 2011

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Abstract

Despite the recent security improvements in Adobe's PDF viewer, its underlying code base remains vulnerable to novel exploits. A steady flow of rapidly evolving PDF malware observed in the wild substantiates the need for novel protection instruments beyond the classical signature-based scanners. In this contribution we present a technique for detection of JavaScript-bearing malicious PDF documents based on static analysis of extracted JavaScript code. Compared to previous work, mostly based on dynamic analysis, our method incurs an order of magnitude lower run-time overhead and does not require special instrumentation. Due to its efficiency we were able to evaluate it on an extremely large real-life dataset obtained from the VirusTotal malware upload portal. Our method has proved to be effective against both known and unknown malware and suitable for large-scale batch processing.