Malicious PDF — malware analysis report

Static analysis result for SHA-256 b560c6e3f7a0cbf2…

MALICIOUS

PDF

19.1 KB
MD5: 158e8fc92faf081d5be1fbcf42f18343 SHA-1: 90b2b3e735a33c0a4a226cb244f562e7277cf661 SHA-256: b560c6e3f7a0cbf2915fc9c52838b562c2f23c1cab4e499ff12d490ba7dc423f
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with ClamAV identifying it as '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 a secondary malicious file. The document body content is obfuscated and does not provide clear user-facing lures.

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
56f9751a448e54675e72f346802414926639858a4ec5fa5f8ffa9d5837ef9b3b
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18812 bytes