Malicious PDF — malware analysis report

Static analysis result for SHA-256 a551c7de558e91c9…

MALICIOUS

PDF

79.1 KB
MD5: bab69fb5bd0f0625464cfb8942d8175c SHA-1: 985305e894dbe5287bcdcd062884f705f3042b42 SHA-256: a551c7de558e91c948919b5b2de2616180d49944a7fa8fb4728ba85c5147a93f
178 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF was flagged by multiple high-severity heuristics, including ML classification and ClamAV detection as 'Pdf.Exploit.Agent-6136306-0'. An embedded script payload was also detected and identified by ClamAV as 'Js.Exploit.HTML-29'. The presence of XFA form elements suggests an exploit targeting PDF rendering or scripting capabilities. The embedded script likely downloads and executes a second-stage payload.

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_0000023c.bin
f0058b71d3e2ab5d1058a93146a73d9d434caeef2ed542476fe4bfd37ecf8882		 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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