Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e36b587eca2945…

MALICIOUS

PDF

79.1 KB
MD5: fa9be61a1a1c965fab0072b72a23c901 SHA-1: 1240809f183ec74ac8558655b34d9840aeaa6523 SHA-256: 33e36b587eca294516b3faa5f1cbd160c53419563131657d18ffd7362da12ac0
168 Risk Score

Malware Insights

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

The PDF file contains an XFA form and an embedded JavaScript payload, strongly indicating an exploit attempt. The embedded script is heavily obfuscated but appears to be designed to download and execute a second-stage payload, as suggested by the ClamAV detection of 'Js.Exploit.HTML-29' on an extracted artifact. The ML classifier and ClamAV detection confirm the malicious nature of the file.

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_0000023c.bin
cf12b24dfff9d3575dd05ad3854097c655944ac126dfd48dc9a31a38be546cc8		 pdf-embedded-script PDF raw stream script payload at offset 0x23C 80285 bytes
Detection
ClamAV: Js.Exploit.HTML-29
Obfuscation or payload: unlikely

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