Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c55c9bea05fb38…

MALICIOUS

PDF

79.4 KB
MD5: f9c181f1dcbb06153b2de0e50b213fcc SHA-1: 3e2cdedf0d2302a535400bea1966938f1fe2c439 SHA-256: 50c55c9bea05fb381dac8dfb284ad5b53f3c0ac0958165f34a8aed08e37db927
178 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: Malicious Attachment

The PDF was flagged by multiple high-severity heuristics, including ClamAV detections for Pdf.Exploit.Agent, and an ML classifier with a score of 0.999992. The presence of an XFA form and an embedded script payload indicates an attempt to execute malicious code. The embedded script is likely responsible for delivering the secondary payload, as suggested by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic.

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
2830de13ebc3657029c6707e775cf7ecee52fff87192c868dffd844ff677547f		 pdf-embedded-script PDF raw stream script payload at offset 0x23E 80555 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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