Malicious PDF — malware analysis report

Static analysis result for SHA-256 46309a46145c9eb2…

MALICIOUS

PDF

123.2 KB
MD5: c5a6cedb6be84f16eba21f7c1f844eaf SHA-1: 9776166c36b29b53a07ebe056dc97e8557161408 SHA-256: 46309a46145c9eb2b2b84c5c918f0ba0dffe0de14f583b0cb68aa75aa92eab59
118 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically detecting an embedded script payload. The presence of XFA form elements and an embedded script suggests an exploit is being used to deliver a secondary payload. The embedded script is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://www.xfa.org/schema/xfa-template/2.5/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00000329.bin
fb93b7d35a540e939f873da376c09349791ba0d1d31e3ead8b01472e959bb7fe		 pdf-embedded-script PDF raw stream script payload at offset 0x329 125477 bytes

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