Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84139ac6efd38e6…

MALICIOUS

PDF

8.8 KB Created: 2009-11-29 19:44:33 Authoring application: PDF Library 1.6.3 (via PDF Library 4.2.8)
MD5: 71a15997cd80e7ec006d88996c05b106 SHA-1: 321457656a90be317a4b4fef0ff162b394d08099 SHA-256: e84139ac6efd38e6d7b0e45416766e995c8ae8705b9adb3828f938fa11e8cfa0
338 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

This PDF document exploits multiple known Adobe Reader vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. Static analysis identified embedded JavaScript, which was deobfuscated into 'legacy_pdfkit_stage_000.js'. This script is indicative of a dropper mechanism, likely designed to download and execute a second-stage payload. The ClamAV detection of 'Pdf.Dropper.Agent-7318389-0' further supports this assessment.

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-7318389-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7318389-0
  • 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
8adcc32a062d0be52a81dd048bd2c6127bd8df25ad5ff5d81b3e2b080ed36c11		 pdf-javascript-stream PDF /JS object 7 at offset 0x268 37446 bytes
legacy_pdfkit_stage_000.js
0bd0d7b29768f58d325b0398de4f541b3f7ddc5217c7a5d97de250415ae82aa4		 deobfuscated-js numeric array subtract-key decoded JavaScript at offset 0x268 9874 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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