Malicious PDF — malware analysis report

Static analysis result for SHA-256 660afc0fb7b8b3e0…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 95f5650c739d32612c9e7a4b81779bc1 SHA-1: 025e171860baec7329b6fc093a45faa57260a368 SHA-256: 660afc0fb7b8b3e001993ebe5934647f842e75646252f0d80607822b08104ccf
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an XFA form and an AcroForm button with an action trigger, indicating it is likely designed to exploit a PDF vulnerability. The embedded artifact 'stream_001_off000008ed.bin' is a decompressed PDF stream, further suggesting malicious content within the PDF structure.

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
ee76a4b57ba0926050990565da4ebaf42d5e2350d692caa375be87fd1e703629		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1432 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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