Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab565e0a9e5ddfc6…

MALICIOUS

PDF

250.1 KB
MD5: a643fb36eb2438c0390ac3d034a7c85c SHA-1: a185a71d7118859d2a43544a9ee2dda52611a36b SHA-256: ab565e0a9e5ddfc62a29a699c41c481cadb7ccc43cd31b580e33af6b59e7d8f2
258 Risk Score

Malware Insights

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

This PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. These vulnerabilities are leveraged through embedded JavaScript, which is further confirmed by the 'PDF_JAVASCRIPT' and 'PDF_JS' firings. An extracted artifact, 'legacy_pdfkit_stage_000.js', was flagged by ClamAV as 'Js.Exploit.Shellcode-18', strongly suggesting the JavaScript's purpose is to download and execute a malicious second-stage payload. The obfuscated nature of the JavaScript and the use of known PDF exploits point to a downloader or initial access stage.

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
83611676fbc9007b350a733cda1ee5bec5cea065c96bf50a9742539aa7db0e86		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 3415 bytes
legacy_pdfkit_stage_000.js
01642408a77df6e383156fa2759a6e1b91ed65191d36799e53f833effbc11ac1		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xF72 8394 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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