Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2829fd5172226a…

MALICIOUS

PDF

3.6 KB Created: 2010-02-12 08:24:41 Authoring application: a523c1
MD5: 973ff83bba24733885ef4e13d560b745 SHA-1: 6aa26183cc6919172352b1067cd75fc4fe92e3c1 SHA-256: ca2829fd5172226a7ca7cc95ee513a453c91e5d038c56ad9bd10b8990ff16451
258 Risk Score

Malware Insights

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

The sample is a PDF file that exploits CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659 by executing embedded JavaScript. This JavaScript is further deobfuscated and detected by ClamAV as 'Js.Exploit.Shellcode-18', indicating it likely downloads and executes a second-stage payload. The extracted artifact 'legacy_pdfkit_stage_000.js' is also suspicious.

Heuristics 7

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
  • 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)
  • 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.
  • 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_obj0011_000.js
3076c314889433b1c479d221f0a811850778d58ca2c7eb5f27a2f695d84815db		 pdf-javascript-stream PDF /JS object 11 at offset 0xCB 576 bytes
legacy_pdfkit_stage_000.js
aeb9b863976fd6a0ad8cac085acae9220b912a3aeba59bcc610f85ab6479ee95		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x3CA 6278 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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