Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08babf2bcfcb68e…

MALICIOUS

PDF

12.3 KB Created: 2009-12-17 19:45:54 Authoring application: PDF Library 4.10.9 (via PDF Library 7.3.5)
MD5: 652ec8644200efd4d4b1b8a7b7897afb SHA-1: d47fd04fcbad48d85e2d42528c82749206302f00 SHA-256: d08babf2bcfcb68eed6ff022abdf98d19f1895942a0e5f9b504f67b495c554b3
278 Risk Score

Malware Insights

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

The PDF exploits multiple known vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992, indicating it's designed to deliver a second-stage payload. The embedded JavaScript, identified as 'legacy_pdfkit_stage_000.js', likely contains obfuscated code intended for exploitation. The ClamAV detection 'Js.Exploit.Shellcode-18' further supports the malicious nature of the extracted artifact.

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
b38e71e9dac33e40bcee3493d9dcb7a7c1b6d5eeb3c94c79a91bc0bc5af308c2		 pdf-javascript-stream PDF /JS object 7 at offset 0x268 38252 bytes
legacy_pdfkit_stage_000.js
a198bd5dc25bf5bf5f411de3147bb6e6fe6b0fc689ab1ed70d79b006014c35b3		 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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