Malicious PDF — malware analysis report

Static analysis result for SHA-256 65923f5446397561…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: cf50c4e138dc38043c3fb4d7cd13ac96 SHA-1: 28009eea484dd9fbb6910da6dece32cf20ff936a SHA-256: 65923f5446397561dd58f3876a848a21ae0e8d62a7b076ab7e291ba91a0eb66f
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, specifically identified as Pdf.Exploit.Agent-36874. It contains an XFA form and an AcroForm button with an action trigger, indicating it is designed to exploit vulnerabilities within the PDF reader. The presence of a suspicious embedded stream further supports the likelihood of it delivering a secondary payload.

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
31194cbba976d33813a86dc2262cc82cdc7a1bd317585c3617531d107858d4fe		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1414 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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