Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8851a348331468f…

MALICIOUS

PDF

111.2 KB Created: 2009-07-23 08:47:32 UTC Authoring application: Acrobat Web Capture 6.0
MD5: 9efee6e1cea0eea5e94e330f28ec23b2 SHA-1: b0080d594f23ae0e135fc699858d864a9ebfadae SHA-256: f8851a348331468f75ecab40d26a462aaf72c9e927d850385ddba236619f0f49
168 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript and is flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Dropper.Agent-7325887-0'. The presence of a secondary embedded PDF and a suspicious JavaScript object further indicates a dropper functionality. The primary goal appears to be the execution of a second-stage payload, likely facilitated by the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • ClamAV: Pdf.Dropper.Agent-7325887-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7325887-0
  • 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.
  • 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/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0036_000.js
241720d05eb9f1399739386460cd49222f3f00f2fb3c825f619c05307ac296bd		 pdf-javascript-stream PDF /JS object 36 at offset 0x2A35 1803 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
polyglot_child_pdf_off00018d96.pdf
3d39e6230ca4ef29355964dd9cedafe554e0e406e9665a0525bf95626c359dbb		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x18D96 12104 bytes

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