Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8fee9f90be35ae…

MALICIOUS

PDF

79.0 KB
MD5: ea2b257f5033685fa640ef2351dcb0ba SHA-1: 582737cf10ce2cf6b989dd2fc03514e6f68f157b SHA-256: 4c8fee9f90be35ae6e690265317115472aca21f441adc56fea40dcc14df81cb9
180 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious PDF T1059.001 Command and Scripting Interpreter: PowerShell

The PDF utilizes XFA forms and contains an embedded script payload, strongly indicating malicious intent. ClamAV detections further confirm this, identifying it as Pdf.Exploit.Agent. The embedded script is likely responsible for downloading and executing a second-stage payload, though its exact functionality is obscured by the PDF structure. The presence of XFA and embedded scripts points to a common PDF-based exploit delivery method.

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.
  • Embedded script payload in PDF stream medium 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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_0000023e.bin
9dbb43141a793d523bebe5350ef06cbea867263a6d5d021495ae608be99cff48		 pdf-embedded-script PDF raw stream script payload at offset 0x23E 80211 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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