Malicious PDF — malware analysis report

Static analysis result for SHA-256 84aed1e0dfa4eb6a…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 3fe4f59383514ea4fdea90b3cb23fab6 SHA-1: 87b79aa1a05598387f935dd409cc28bb247dd92a SHA-256: 84aed1e0dfa4eb6a02619896a4c4aa690010036aede4190adf1857b72c9327a1
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Agent-36874' and an ML classifier indicating maliciousness. The presence of XFA forms and AcroForm buttons with action triggers suggests an exploit is embedded within the document structure. The ML classifier's high output score and the ClamAV detection strongly indicate this PDF is designed to exploit vulnerabilities for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-36874 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36874
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_001_off000008ed.bin
9ac4045999f6342bf59637fa4473d47687161a73c6dd17569587641670c2dcd9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1443 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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