Malicious PDF — malware analysis report

Static analysis result for SHA-256 753b6329657fa383…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 34a3a103dddc8c75ec7ea93f9114fda9 SHA-1: f1204578dc9b12240acade21c565657c435cabaf SHA-256: 753b6329657fa3831297b4413fb4783e6ee9c3506a1bc80a7f5261370bbe0ee4
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file 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 forms and AcroForm buttons suggests an attempt to exploit PDF rendering or form processing vulnerabilities, likely leading to client-side code execution.

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
1444c62870ea273c71e3528be2ebde04437c342d9101dd6d0f77ae408a8e3cea		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1497 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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