Malicious PDF — malware analysis report

Static analysis result for SHA-256 c909df2175ccbf3e…

MALICIOUS

PDF

11.9 KB Created: 2009-10-30 19:45:84 Authoring application: PDF Library 1.10.7 (via PDF Library 7.3.9)
MD5: c9aad1ecee10ddcf1985ae4961e18fbf SHA-1: 5decd553fd29f6133d78f0474e5247692340cf25 SHA-256: c909df2175ccbf3e8ddac69202bc07f0967e9f0f39eb1414d7b20b3d03ac3be1
338 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols

This PDF file exploits multiple known Adobe Acrobat vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. Static analysis indicates that the embedded JavaScript, specifically the deobfuscated 'legacy_pdfkit_stage_000.js', is designed to download and execute a second-stage payload. The ClamAV detection 'Pdf.Dropper.Agent-7303062-0' further confirms its malicious nature as a dropper.

Heuristics 9

  • 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: Pdf.Dropper.Agent-7303062-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7303062-0
  • 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
61046d4ef001719fa502dd234bd84bef6c8b104653f7adbd2ef1d2af6b23856d		 pdf-javascript-stream PDF /JS object 7 at offset 0x268 38507 bytes
legacy_pdfkit_stage_000.js
bd60bf8d6d82d033f7ca3650e6305638c2db40113a2ad721d3c539272111c9d2		 deobfuscated-js numeric array subtract-key decoded JavaScript at offset 0x268 9988 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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