Malicious PDF — malware analysis report

Static analysis result for SHA-256 1099efa646afa20f…

MALICIOUS

PDF

79.1 KB
MD5: a0660a7238bd1231ee2108ccaa1f634c SHA-1: 7e7b93ee120b5e00163289fbbe183c99e29b42a6 SHA-256: 1099efa646afa20f169ddb28983bf747bc38c9862feb37e62968f8b3779292f9
168 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple engines, including ClamAV, which identified it as 'Pdf.Exploit.Agent-6136306-0'. The presence of an embedded XFA form and a JavaScript payload within a PDF stream strongly suggests an exploit targeting PDF vulnerabilities. The script, though obfuscated, appears to be designed to execute further malicious code, likely a downloader for a second-stage payload. The benign URLs extracted are not indicative of malicious activity.

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
5d1fa041a12eb2f4ec01cc3e86451e2a68fa61b099b0fcb2f94e7c2409ff69f1		 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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