Malicious PDF — malware analysis report

Static analysis result for SHA-256 d431b168f967c187…

MALICIOUS

PDF

297.7 KB
MD5: 84f9f047054baa4338ec84d32f0a6bd9 SHA-1: 88a599a477c50e0967927f1081726915f3e188ed SHA-256: d431b168f967c187219125500cd8c0394aaab836066e3491b586c08709d473b8
258 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 including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The critical heuristics indicate that the JavaScript is obfuscated and likely responsible for downloading and executing a secondary payload, as confirmed by ClamAV detection of 'Js.Exploit.Shellcode-18'. The extracted JavaScript, 'legacy_pdfkit_stage_000.js', is also flagged as suspicious due to obfuscation.

Heuristics 7

  • 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.
  • 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
b5f927553277c0f58a1ef87390d8065bb8e3a5b4c7c70ed45a969381a1dc8018		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2462 bytes
legacy_pdfkit_stage_000.js
e637e70d32df388a9f3335487a5a1389da1c12215be19c1f3892440d7b458a01		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xBB9 8376 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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