Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c5343b36fc8af3…

MALICIOUS

PDF

101.5 KB
MD5: a57f614fc82e1480000feec80fd44958 SHA-1: 16cac13b6fdf8b15237c9a102ba9e827cbd160c3 SHA-256: 83c5343b36fc8af31feb2099fe1c3143dddf1a9dc9eeeae53e7cce34608a9373
108 Risk Score

Malware Insights

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

The PDF utilizes XFA (XML Forms Architecture) and contains an embedded JavaScript payload. This script is designed to download and execute a secondary payload, as indicated by the ML classifier and ClamAV detection. The benign URLs present are likely decoys or standard XFA schema references.

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
  • 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_0000025e.bin
4b0752f72a4cf62a53bafc82b967d4e67d1923b6bd782b61778390751d7aae0b		 pdf-embedded-script PDF raw stream script payload at offset 0x25E 103263 bytes

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