Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef21d9be0de88a2…

MALICIOUS

PDF

97.3 KB
MD5: e4f2f57a2574132f86b5f7eb1ccc5235 SHA-1: e8f7be2adda1462e26359f0517b699b7cd744964 SHA-256: aef21d9be0de88a203fab87a29db41a6ecdd5896a34dca27764dadcafed3544b
120 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded script payload, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic. The presence of XFA form elements (PDF_XFA) suggests a potential vector for script execution. The embedded script is likely responsible for exploiting a vulnerability to download and execute a second-stage payload, although the script itself was too obfuscated to analyze further. The confidence is high due to multiple strong indicators of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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_0000026c.bin
d0f9ed182218de45ed36645a87bf59d2df22c807cbe100b7939dac99b27662ef		 pdf-embedded-script PDF raw stream script payload at offset 0x26C 98867 bytes

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