Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ebaa0af695e8e1…

MALICIOUS

PDF

93.4 KB
MD5: 7506d8b5112b7bf5019e0b2397dfb86a SHA-1: 9fcc31d5b927c52a065f8f3bf316a5023c06b656 SHA-256: 75ebaa0af695e8e12664c9db4b770d38cdb7a17d0cc42aae710184ca2a7f6df9
168 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript within an XFA form, a known vector for exploitation. ClamAV detections indicate this is a known exploit targeting PDF vulnerabilities. The embedded script is heavily obfuscated but appears to be designed to download and execute a second-stage payload, as suggested by the ML classifier and heuristic firings.

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_00000246.bin
b8585badce719bd697e19b77696be3582d7bec0f009784b730f8b46d0062d5b3		 pdf-embedded-script PDF raw stream script payload at offset 0x246 94924 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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