Malicious PDF — malware analysis report

Static analysis result for SHA-256 d285949cf804768a…

MALICIOUS

PDF

12.4 KB Created: 2009-11-11 19:45:80 Authoring application: PDF Library 8.6.1 (via PDF Library 5.9.9)
MD5: 34507fc91f10c1ffd5e81921aad239e5 SHA-1: 2a8b6cd700f8070be7ce53912d89d36ed5ccc8fc SHA-256: d285949cf804768acf94a1b144c7a8945147f5d5dfb1128abf59bda66754f7f7
278 Risk Score

Malware Insights

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

This PDF document exploits multiple critical vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 by leveraging embedded JavaScript. The JavaScript, identified as legacy_pdfkit_stage_000.js, is heavily obfuscated but static analysis indicates it decodes and executes shellcode. This shellcode is further flagged by ClamAV as Js.Exploit.Shellcode-18, suggesting it's designed to download and execute a secondary payload.

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
368b0f19b69493f3f472a69229fe65ae8909318932de3167503e2b12229f5fc5		 pdf-javascript-stream PDF /JS object 7 at offset 0x268 38261 bytes
legacy_pdfkit_stage_000.js
a2e2fa95f6162db7a07a91d356e3108b07353c4e4a58b2f82eab0a02ff5d4771		 deobfuscated-js numeric array subtract-key decoded JavaScript at offset 0x268 9880 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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