Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4bc724011c5277…

MALICIOUS

PDF

68.7 KB
MD5: 5cc4b32f3687f1c86b38d7ed0deaefc6 SHA-1: 585cd7f1447139e0f02e29b3816139bb3df1ec5b SHA-256: cb4bc724011c5277ca07f04bc594708bf583ffcdd21e22724a7daffabe7ed211
318 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that exploits multiple known vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) related to JavaScript execution within Adobe Reader. The heuristics indicate that this JavaScript is used to launch a secondary stage, as confirmed by ClamAV detections on extracted artifacts. The deobfuscated JavaScript likely facilitates the download and execution of further malicious content, consistent with a trojan agent.

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: Win.Trojan.Agent-36170 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36170
  • 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
f56679ab8536636b4ec532e093e8872fd3b33afdcdf61cb52396f797f8975bf8		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 1667 bytes
Detection
ClamAV: Win.Trojan.Agent-36170
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
b67b45a9b9c7f5ea5397f909d425436e07ed10d077e8e85eb14fb6c85c697195		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x89E 4524 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 9 eval/decoder/string-building token(s).

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