Malicious PDF — malware analysis report

Static analysis result for SHA-256 0309218f5afd158f…

MALICIOUS

PDF

82.7 KB
MD5: b2896cbbcd30197d6f8872f8dc0b5aa8 SHA-1: 11f0f5d25360969045ed0a65badc42195f666d18 SHA-256: 0309218f5afd158f7644de6c867544a20862d17d41e1b90ac1ff1c3325357559
168 Risk Score

Malware Insights

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

The PDF utilizes XFA (XML Forms Architecture) and contains embedded JavaScript, as indicated by the PDF_XFA and PDF_EMBEDDED_SCRIPT_PAYLOAD heuristics. The ML classifier and ClamAV detections strongly suggest malicious intent, specifically targeting PDF exploits. The embedded script, though obfuscated, appears designed to download and execute a secondary payload, a common technique for initial access via spearphishing attachments.

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
eeb9832329feb5cce55b366e92035745956b640e32219ba38bb719fb16bf298b		 pdf-embedded-script PDF raw stream script payload at offset 0x246 83929 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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