Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95cd5d7d2fb36a5…

MALICIOUS

PDF

79.1 KB
MD5: abba590b96d1bcaf3a389a42f3c01737 SHA-1: 417772f67629548690b3e80f56ca8254e394bbf4 SHA-256: c95cd5d7d2fb36a53d1c53931ea98d1e8de5df6071b2fc1ead584e85f2ff6d02
178 Risk Score

Malware Insights

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

The PDF file utilizes XFA (XML Forms Architecture) and contains an embedded script payload, as indicated by multiple heuristic firings including critical ClamAV detections. The ML classifier also strongly flagged this PDF as malicious. While the document body is minimal and the embedded URLs are related to Adobe XFA, the presence of the embedded script and the ClamAV detections point to a malicious exploit delivery mechanism. The exact nature of the embedded script's action is not fully discernible from the provided evidence, but its presence within an XFA PDF is a strong indicator of malicious intent.

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.
  • 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_0000023e.bin
ffeeb32f77db7c749ff2043afe835ac26a5390ddd385a1ab570b4169842cd2d1		 pdf-embedded-script PDF raw stream script payload at offset 0x23E 80301 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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