Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef9243ad4fb157a…

MALICIOUS

PDF

164.0 KB
MD5: d502aa7c01ff21ab5590b06751ec0760 SHA-1: 23f10dbfa60fdbd012ebddfab65354d61993a247 SHA-256: 2ef9243ad4fb157aaac04986cbeb6a076d317007fbcea7f159afb61162436dc6
318 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that leverages multiple known vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) to execute code. ClamAV detections indicate this is a known exploit, likely Pdf.Exploit.Agent-24124, which further suggests the embedded JavaScript is designed to download and execute a second-stage payload. The deobfuscated JavaScript artifact 'legacy_pdfkit_stage_000.js' confirms the presence of exploit code.

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: Pdf.Exploit.Agent-24124 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-24124
  • 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_obj0008_000.js
3578b85fabfb2ab62ef50298567b8df98eeb9691ca109fc6cfa4857b08e330b1		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 3145 bytes
legacy_pdfkit_stage_000.js
6f9f7ab0156a5a2ab91272a27ab7c6cb4c3567175515f9e1f4a41da2f04c4c52		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xE64 10928 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 11 eval/decoder/string-building token(s).

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