Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbebb1a841ed5291…

MALICIOUS

PDF

114.7 KB
MD5: c4a509056310b01dec9a21e782cf8b68 SHA-1: 9c7fb63607fa11208042add75e3ea9d2e30a7d1b SHA-256: fbebb1a841ed5291d94367621fcd316d35058e8e813430a2df5f77688bed9cb7
218 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF document contains XFA forms with embedded JavaScript, identified as a heap spray exploit. This script is designed to download and execute a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of XFA and embedded script points to a common PDF exploit delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY
    PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • 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_0000023c.bin
4f7afacfcfc48881745121bd684078850b6afb262c66c4ba96651b1b4bda9c99		 pdf-embedded-script PDF raw stream script payload at offset 0x23C 116698 bytes

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