Malicious PDF — malware analysis report

Static analysis result for SHA-256 559078ba84477a4a…

MALICIOUS

PDF

18.8 KB
MD5: d83c567bc59ac81c0169474641b07266 SHA-1: dcfba453c20951b907aa8d3e941c56ef6ea52b0d SHA-256: 559078ba84477a4a9b191871a158462a6175f90dde8910a26db55f40eda50b39
126 Risk Score

Malware Insights

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

The PDF was flagged as malicious by multiple engines, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-78'. Heuristics indicate an embedded script payload and an embedded file, suggesting the PDF is a dropper. The ML classifier output of 0.999996 further supports the malicious nature. While no specific script content was provided for detailed analysis, the presence of embedded objects and exploit-related heuristics strongly indicates a payload delivery mechanism.

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
2fd32f2723946826ed2b4f2e1af56b7870f80b4e09d681b641192dfb111cae59
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18533 bytes