Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc497583df7e681…

MALICIOUS

PDF

82.6 KB
MD5: 09f2a2b1e011f6b3befe166182faa020 SHA-1: 489c09ed28aa242a9e3aaf26f07a9c7286de8a1b SHA-256: 7fc497583df7e681f35599f668a1f81fcb02414cf561454c02b56010a82338e1
168 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple engines, including ClamAV and a machine learning classifier. It contains an XFA form with embedded JavaScript, which is a common technique for executing arbitrary code. The script appears to be obfuscated but is designed to download and execute a second-stage payload, as indicated by the 'eval' function and the structure of the script. The embedded URLs are confirmed benign and do not appear to be part of the malicious payload delivery.

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
f089203945a3dacde769e14f014e7f00630d7d8c226ed2de22973792ceecbb87		 pdf-embedded-script PDF raw stream script payload at offset 0x246 83839 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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