Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ddc31be12caf7c…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 1d11cd8af241e192c601e7d4bb1f7309 SHA-1: f9713193b1cdb15d9ddc07ed5ac34ff7aadcb95a SHA-256: 05ddc31be12caf7cd17bb84a0c084e9db13d03f5b34c72bd85dd640104abb990
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The PDF file contains an XFA form and an AcroForm button with an action trigger, indicating it is designed to exploit vulnerabilities. ML classification and ClamAV detection confirm its malicious nature, specifically identifying it as Pdf.Exploit.Agent-36874. The embedded stream artifact suggests the presence of exploit code.

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
a29292d7770bfcdad0c47f66e9e822861db8ebc2f3496b9692d0fac50979199f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1439 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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