Malicious PDF / .VIR — malware analysis report

Static analysis result for SHA-256 2aeacd40605fb681…

MALICIOUS

PDF / .VIR

76.6 KB
MD5: 1762491e8c2a7a7c039e27f4248da12a SHA-1: 0ea74d3a0e4b4dc07837c232cf572623a985d81e SHA-256: 2aeacd40605fb681af76265f695956c92c10bcbad9e92b7fcacbef78fb796e35
242 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059 Command and Scripting Interpreter T1059.001 PowerShell T1059.007 JavaScript T1190 Exploit Public-Facing Application

The PDF file contains multiple critical heuristic firings indicating exploitation of legacy Adobe Reader vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992). These vulnerabilities are used to execute obfuscated JavaScript, identified as 'legacy_pdfkit_stage_000.js'. This script likely acts as a downloader for a second-stage payload, as suggested by the ClamAV detection 'Js.Exploit.Shellcode-18'.

Heuristics 5

  • 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.
  • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
legacy_pdfkit_stage_000.js
12f8b911c4b12fe19ff34286082a9bfc3c01f950daa2749e170b83fc252cdfdd		 deobfuscated-js numeric array subtract-key decoded JavaScript at offset 0x4F 10108 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 9 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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