Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff946a478d24822…

MALICIOUS

PDF

26.1 KB
MD5: 9804d5cc80b290acc22a68800ac7dd34 SHA-1: 29972a055d1a37ce998c6d6b2b91799170f97e2f SHA-256: 4ff946a478d24822e1d06376445f542d89eb448c49ea80ef9ead29d372c423af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious Attachment T1566.002 Phishing: Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-78'. The presence of an embedded script payload and an embedded file strongly suggests it is designed to exploit vulnerabilities and download a secondary payload. The ML classifier also returned a very high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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_file_obj0008.bin
acfc8b13825b192cb2be5f3991ab27523b25e5d4f25c0c3b84c130963b344d5d		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 25932 bytes

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