Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4f5d8951741270…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 8f095b47dc9e7c139657debf396f1c93 SHA-1: 454de184b727bc5c218231f6cb70f3255cc721c1 SHA-256: 6a4f5d8951741270057c2d0ff3caae44412257c10faee610efcee2dbe52bbff6
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 an ML classifier also flagged it with high confidence. Heuristics indicate the presence of an XFA form and an AcroForm button with an action trigger, suggesting an exploit is embedded within the PDF structure. The embedded artifact stream_001_off000008ed.bin likely contains the exploit 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
a9a483f7ec182caecfed840dc5dc9621089323110e1f5aef239c4e5db60171ac		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1448 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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