Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81a4efaee203918…

MALICIOUS

PDF

97.3 KB
MD5: f3b685eafaa25069162000c25bfde3c5 SHA-1: cc19426f69e85f881fe5f16f31fe5af37a477860 SHA-256: f81a4efaee203918015480d406040468d6d72bc0390eabea63d1ad58fc0a94b5
118 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell

The file is identified as a malicious PDF by ClamAV and a machine learning classifier. The presence of an XFA form and an embedded script payload indicates an attempt to exploit vulnerabilities or execute malicious code upon opening. The embedded script is likely responsible for downloading and executing a second-stage payload, though its exact functionality is obscured by the PDF structure. The primary IOC is the file hash itself, as no external URLs or specific script details were clearly extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • 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_0000026c.bin
8e884e8f9a709db1af36211e4aeb9d8f6ad84fe649630ef00efb363c162e69fa		 pdf-embedded-script PDF raw stream script payload at offset 0x26C 98869 bytes

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