Malicious PDF — malware analysis report

Static analysis result for SHA-256 1905cbf641151fbf…

MALICIOUS

PDF

11.0 KB
MD5: f5ac9c162da334e9bb013fdcb1addbd3 SHA-1: 25be7ec45662afd112fa23347e35280418d2d95e SHA-256: 1905cbf641151fbf5eb844b728ec594e72abc1f684faaed5d32cd0156f4f4ead
168 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 execute arbitrary code, as indicated by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics. The embedded script likely downloads and executes a secondary payload, a common technique for initial compromise via malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_0000026a.bin
f12fe50a6a4f21d15f2ac0282126049a7d11c7865372a1520bf414e38dce9dd6		 pdf-embedded-script PDF decompressed stream script payload at offset 0x26A 11260 bytes
Detection
ClamAV: Pdf.Exploit.Agent-6136306-0
Obfuscation or payload: unlikely

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