Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f20db3a1f66688…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: c68865f2c147dfe283f0a90229115f5e SHA-1: 6d1b6d18748929b5e91b4b638b12798e1d0c1496 SHA-256: 88f20db3a1f666888cc5ee6f66b1e4a25936485232ea8477e93874f81cd36197
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The critical ClamAV detection and high ML classifier score indicate malicious intent. The presence of XFA form elements and an AcroForm button with an action trigger, combined with the ML_NYX_PDF_MALICIOUS heuristic, strongly suggests exploitation of a PDF vulnerability. The embedded artifact 'stream_001_off000008ed.bin' likely contains the exploit code or 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
6a6b4f21afa423c5775d7a4e7428349ca21c17a8b17c75fcc2a0161e4873b842		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1443 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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