Malicious PDF — malware analysis report

Static analysis result for SHA-256 64624f4f8b3ea01e…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 2b41ea112f07ea4cd2f04c03501ab914 SHA-1: 66cc94566dc375cf91810e1b00f7ede9e5dd5eac SHA-256: 64624f4f8b3ea01e54a6a7e3ea6245b60aa293d2fde19db72eddfa6c24c5de6a
110 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Agent-36874' and an ML classifier indicating maliciousness. The presence of XFA form elements and an AcroForm button with an action trigger suggests an exploit is embedded within the document structure. The file likely leverages a known PDF vulnerability to achieve code execution, aiming to download and run a further stage.

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
84ee37a84a7d08de2840f4cedbdd4c3c54431fb2bfef2a6434f4cbaa56d46209		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1474 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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