Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3e4313ce6efe22…

MALICIOUS

PDF

11.8 KB
MD5: 98de229f02cd2a97fef47bc2b27494d5 SHA-1: 3b76a5baa5d23e7fe7f7d2d216597274a7dec0fa SHA-256: ac3e4313ce6efe22952d94ae5bc196944d5b2d803bd8603a8f274203a150c5f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The PDF was flagged by a machine learning classifier with a high probability of being malicious and was also detected by ClamAV as Pdf.Exploit.Dropped-78. Static analysis revealed an embedded script payload and an embedded file, indicating the PDF is designed to exploit vulnerabilities and deliver a secondary payload. The embedded file 'embedded_file_obj0008.bin' is a primary indicator of malicious activity.

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
cfa9e71ea7547dc6921412b19fa00bb2a86fe6b149c4638d2ac0c40c5f12e5d1
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11323 bytes