Malicious PDF — malware analysis report

Static analysis result for SHA-256 479962250ebcdfa1…

MALICIOUS

PDF

18.2 KB Created: 2011-01-20 15:30:08
MD5: efe66ee3f63ce61c3dcd78a07af14aee SHA-1: 4f001bced3e8893ab52ba1d174aa22d3149c1bd5 SHA-256: 479962250ebcdfa19cb8b46896bec1b8d7d24181bca47b821fa5bb1f86a31988
156 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

This PDF sample was flagged as malicious by a machine learning classifier and ClamAV with the signature Pdf.Exploit.Agent-36859. It contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics, which is a common method for exploiting PDF vulnerabilities. The presence of ASCIIHexDecode and JBIG2Decode filters further suggests obfuscation and potential exploit code. The primary attack pattern involves leveraging these embedded scripts to likely download and execute a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Exploit.Agent-36859 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36859
  • JBIG2Decode filter medium PDF_JBIG2
    JBIG2 image decoder present — historically used in zero-click exploits
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
jbig2_00_off000028ca.bin
833fe8ec86289306ecbc0f0d08aa0c6de1e14eb3bb09ac4adcbe2577458bae17		 pdf-jbig2-stream PDF JBIG2 stream (Flate-decoded) at offset 0x28CA 6161 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.97, consistent with packed or encrypted content.

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