Malicious PDF — malware analysis report

Static analysis result for SHA-256 850e94067f432a27…

MALICIOUS

PDF

79.3 KB
MD5: a38e2ccd585eedebcef21943b7331cc3 SHA-1: 51fed4a499af83c2ee415cf4492c2f08df42951e SHA-256: 850e94067f432a27559a59cdee1d824a271fc8cc030e2c910836be1d8bd9b627
168 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating an XFA form and an embedded script payload. The embedded JavaScript is heavily obfuscated but appears to be designed to download and execute a secondary payload, as suggested by the structure and typical behavior of such exploits. The benign URLs related to Adobe and XFA do not appear to be directly involved in the malicious activity.

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_0000023e.bin
86b72814e76c1d0e870658788069dcaae01ea64e1bf0d08c9141921c3d0d5afe		 pdf-embedded-script PDF raw stream script payload at offset 0x23E 80467 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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