Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab718c595acbc81…

MALICIOUS

PDF

11.8 KB
MD5: 04488647abbfa4b14738ae40fca01da0 SHA-1: b31ea294e1689681b8bfdd5eb1f98d0a49adcb14 SHA-256: aab718c595acbc81db75ec06b795d3ab98e8c49cef07df01654198a9126b951f
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically 'Pdf.Exploit.Dropped-78'. Heuristics indicate the presence of an embedded script payload and an embedded file, suggesting it's designed to drop and execute further malware. The embedded URLs, while not directly malicious, are part of the PDF structure.

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
07d2696d16adf6f91f693477f064a69ca88cfe7bde9887c2c7373354f0fbd92d
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11335 bytes