Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c41694ca5f1eabe…

MALICIOUS

PDF

82.6 KB
MD5: f4dca3b11dc3c1113a722ea2057f0a2b SHA-1: fc71dd0b0707082f95884a9efab7b00810ba2f11 SHA-256: 5c41694ca5f1eabe9182f36cf1aa287eee4672fb13c227d9265fb456b098ddea
168 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple engines, including ClamAV and an ML classifier, with critical detections for PDF exploits and embedded script payloads. The embedded JavaScript, though obfuscated, is designed to execute code, strongly suggesting it acts as a downloader for further malicious activity. The presence of XFA form elements further indicates a complex PDF structure often used for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded script payload in PDF stream low PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00000246.bin
018b9a6dfed54b2ebf53309e25acda72f30b17dc1241fe0c906d832b31f573c8		 pdf-embedded-script PDF raw stream script payload at offset 0x246 83835 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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