Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c34e64aaf5a656f…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 67ecbfa9f5f1da8cf1b293207a384970 SHA-1: c82198a81cb1df193f41580e5e50397826e18456 SHA-256: 0c34e64aaf5a656f4ab153b8305ad237d08c71aa51cf9e0975b37b7108384f4b
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV with the signature Pdf.Exploit.Agent-36874, and a machine learning classifier also flagged it with high confidence. The presence of XFA form elements and an AcroForm button with an action trigger suggests exploitation of PDF vulnerabilities. An embedded binary artifact was also extracted, likely containing the malicious payload.

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
a030527b7241a3223c6b77f753c1f6d1f137549b92df0976d1a15c776525000a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1455 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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