Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac92881beb5b101…

MALICIOUS

PDF

79.1 KB
MD5: bd94433e67eafcd3b25fbbe60445759e SHA-1: e136e5d26c1f0f8f40c4ad09efe78575aeb08b48 SHA-256: 7ac92881beb5b10100b28cc67d6097f835ce8ec17a9140728f6f4d261e966d02
168 Risk Score

Malware Insights

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

The PDF was flagged as malicious by ML classifiers and ClamAV, specifically detecting an exploit and an embedded script. The embedded JavaScript, though obfuscated, is designed to execute code within the PDF context. This strongly suggests the PDF is a dropper or exploit document intended to initiate a malicious chain of execution, likely by downloading a further stage.

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
7eb5cd10eae80e0b572a9e3f0f7cd9d925f6cc3973dc4c2184cdd2aa6724f2f2		 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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