Win.Dropper.Agent-34536 — PDF malware analysis

Static analysis result for SHA-256 06a9440ad45ed14a…

MALICIOUS

PDF

413.1 KB Created: 2007-02-25 14:30:32 +08:00
MD5: 0ed2cb34a827c1886471236659a0d1e2 SHA-1: ca1601c6d25a777ebe11bb79cfa20587499e21dd SHA-256: 06a9440ad45ed14a4e10105d4fa381dd47a2ceb9db5b749fbafbeec1f35c595a
338 Risk Score

Malware Insights

Win.Dropper.Agent-34536 · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo) to achieve code execution. The JavaScript code is heavily obfuscated but appears to be designed to download and execute a secondary payload. ClamAV detection of 'Win.Dropper.Agent-34536' further supports the malicious nature and likely function as a dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 10

  • 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. (matched in decompressed stream)
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • ClamAV: Win.Dropper.Agent-34536 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.Agent-34536
  • 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.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0026_000.js
724e54aec943b411e51fef3293fcc1477add46587fda04af9c90261f21aba90f		 pdf-javascript-stream PDF /JS object 26 at offset 0xF7F 3683 bytes
Detection
ClamAV: Win.Dropper.Agent-34536
Obfuscation or payload: likely
Carved artifact contains 16 eval/decoder/string-building token(s).

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