Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae04707bb7adb207…

MALICIOUS

PDF

18.2 KB Created: 2011-01-20 15:30:08
MD5: cc1913b8604f14ec53947b672be9bed4 SHA-1: 9c2a08d31cdc6f9bda88c12d85a8b9a2e8e63a65 SHA-256: ae04707bb7adb2074e85434cf1ea3f106bb24b65418dd5a0e4eb345ca58ac629
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV with the signature Pdf.Exploit.Agent-36859. It contains embedded JavaScript and utilizes JBIG2Decode and ASCIIHexDecode filters, which are often associated with PDF exploits. The embedded JavaScript is likely responsible for downloading and executing a second-stage 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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