Malicious PDF — malware analysis report

Static analysis result for SHA-256 1185c30d9f84df10…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 9aa2dcf3e5057be4fadd5109ba439773 SHA-1: 09f64b7f1b5f3addaa8fca2d68676c6040f7bd5f SHA-256: 1185c30d9f84df10a3c64d2da0c8d0941a32fe27b21fff1b2d629c54b325c5f3
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV with the signature Pdf.Exploit.Agent-36874, and a machine learning classifier also flagged it with high confidence. The presence of XFA form elements and an AcroForm button with an action trigger suggests exploitation of a PDF vulnerability to execute code. No document body text or scripts were extracted, limiting further analysis of the payload's specific actions.

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
ec9251b1c0c52ab45a0031f2206f745fec6a89b86ef1dee61d497766de7e0ae9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1387 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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