Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e45ec16bc7c0e5…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: ff4c49bf1bbdb99b407ce6ac4652eb11 SHA-1: 3f8dcf9fae6e88d5eb1b576a5723613fbcf70974 SHA-256: 18e45ec16bc7c0e596938ab97dfb5d602f094376b03c20e63ef2bba7d5325c1f
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 XFA form elements and an AcroForm button with an action trigger, indicating it is likely designed to exploit a vulnerability. The embedded stream artifact, 'stream_001_off000008ed.bin', is a suspicious extracted file, further supporting the exploit attempt.

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
3bf7800c05bee58a58de0143a8625d32064a7e3ca889ba0a1523298d7edb5111		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1504 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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