Malicious PDF — malware analysis report

Static analysis result for SHA-256 166432b33517a6f3…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: c0a949c37330e8cedb05d4eda1c519b1 SHA-1: 16e8d062946707886c5e2b040405a8a948dcb699 SHA-256: 166432b33517a6f35efc853660ff53b4d4416bd811579ee6630f7e3499e12922
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and a machine learning classifier, indicating it exploits a PDF vulnerability. The presence of XFA form elements and an AcroForm button with an action trigger further suggests malicious intent. No specific IOCs like URLs or embedded scripts were found, but the exploit itself is the primary indicator of compromise.

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
fd8f0971b9ba53c7814205d6602ae7d2a0478d7ed6b79a35db66c8c6dfb55913		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1407 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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