Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb4f683339e3d8a…

MALICIOUS

PDF

100.7 KB
MD5: 301e7c4a368d697045f62b811d201139 SHA-1: f77cb89809bd99a87e5cb14cf3041ee1faaf926b SHA-256: ddb4f683339e3d8a11c4282dcfe23aa5928502dfeb20c84adb45dbefe8d4b5dd
118 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment T1059.001 PowerShell

The file is identified as a malicious PDF by multiple heuristics, including a critical ClamAV detection and a high ML classifier score. The presence of an XFA form and an embedded script payload indicates an attempt to exploit vulnerabilities within the PDF reader. The embedded script is likely responsible for downloading and executing a second-stage payload, although its exact functionality is obscured by the PDF structure. The ML classifier's high confidence score supports the assessment of malicious intent.

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_00000246.bin
00690c22d76c2220db9f75925d56303d7ac0d67ee258d29700eaec7bf11d4628		 pdf-embedded-script PDF raw stream script payload at offset 0x246 102374 bytes

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