Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbddc2e9f7feca80…

MALICIOUS

PDF

229.2 KB Created: 2008-05-21 16:10:52 +08:00 Authoring application: Acrobat PDFMaker 6.0 for Word (via Acrobat Distiller 6.0 (Windows))
MD5: cd6ef44e692f9ef4cf66a31e2ef721be SHA-1: e1fb107bdf8d0a80789d8fdf4d15c4371c6317bf SHA-256: dbddc2e9f7feca80071b0549c7082b7cd9953c0035a72b0a7eac348a867b229d
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple engines, including a high-confidence ML classifier and ClamAV. It contains embedded JavaScript and an embedded PDF, indicating a multi-stage attack. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, a common technique for malware delivery. The presence of XFA forms and potential PDF vulnerabilities further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 8

  • 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.Exploit.Agent-35907 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35907
  • 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
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PermissionError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/xhtml
    • http://www.xfa.org/schema/xfa-data/1.0/
    • 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/pdfx/1.3/
    • http://ns.adobe.com/photoshop/1.0/
    • 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_obj0026_000.js
2e20dfacd3a7e81007f00bb8ab4969f60d05cb22ba11dbec257cc8c492cab443		 pdf-javascript-stream PDF /JS object 26 at offset 0xA9E 1152 bytes
polyglot_child_pdf_off000312f0.pdf
6954f221ea4c7e7cec4eded810e35f3e5c89576c60117e9b38f34bd351b41718		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x312F0 33263 bytes

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