Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c3fb372a2d3dfd…

MALICIOUS

PDF

102.2 KB Created: 2010-07-13 13:53:52 +08:00 Authoring application: GPL Ghostscript 8.61
MD5: c371cde6ece6c27bceef210739d4682f SHA-1: 7dbca8af70daef3fa672640964986fc0dc796cd9 SHA-256: 17c3fb372a2d3dfd5c97f93a68f9f502ebb4815fd904441b9678e2a947533f0b
240 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file that contains embedded JavaScript. Heuristics indicate exploitation of CVE-2009-4324 and CVE-2008-2992, which are known vulnerabilities for client execution. The embedded JavaScript is obfuscated but appears to be designed to download and execute a second-stage payload, as suggested by the use of 'eval' and the complex string construction.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2986

Heuristics 8

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (matched in decompressed stream)
  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (matched in decompressed stream)
  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • Secondary embedded PDF body has suspicious static findings high POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0006_000.js
ee595f02280883816cdc17f37a593d4668a073394fb7e02e22f0f1a581901f9d		 pdf-javascript-stream PDF /JS object 6 at offset 0x18B 6710 bytes
font_00_sfnt_off00010e09.bin
9a598542df55bd4d867e6084457a0ebcf3d1b3a2bd482fb5e5060f5c54255394		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E09 139016 bytes
polyglot_child_pdf_off0000ff23.pdf
8564f59b8d1b96ac051e3dfb7713d261eb1ef8a39fcc79bbc92ce9c24ebb990c		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xFF23 39320 bytes

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