Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a433c66ccd0d92c…

MALICIOUS

PDF

12.3 KB Created: 2009-12-18 19:41:98 Authoring application: PDF Library 7.7.9 (via PDF Library 7.2.10)
MD5: 284151b3b67fffaade9dccbb3052f1da SHA-1: 1921c92a75dd6eb974c5965524080e757a9644cc SHA-256: 4a433c66ccd0d92c5f90f98aac5751b6e0607220acd6841251742040818cb616
278 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link

The PDF exploits multiple Adobe Acrobat vulnerabilities, specifically CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992, through embedded JavaScript. Static analysis indicates that this JavaScript is designed to download and execute a second-stage payload, as evidenced by the ClamAV detection 'Js.Exploit.Shellcode-18' on an extracted artifact. The exploit leverages specific JavaScript API sinks like Collab.getIcon, Collab.collectEmailInfo, and util.printf, which are commonly used in exploit kits targeting older PDF readers.

Heuristics 8

  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
  • 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. (identified after JavaScript deobfuscation)
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
b45b4855baad0c43ea4399be7f32504099cb8cefa14ca807ff8bc840a6fda761		 pdf-javascript-stream PDF /JS object 7 at offset 0x268 38273 bytes
legacy_pdfkit_stage_000.js
5be19df88a27907b09f8a238fb49027694791297cb8b45a053bcd3ee8e6dca21		 deobfuscated-js numeric array subtract-key decoded JavaScript at offset 0x268 9868 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 9 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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