Malicious PDF — malware analysis report

Static analysis result for SHA-256 4623c1254a43e98f…

MALICIOUS

PDF

15.8 KB
MD5: fdc9418b86d1116dd2ad743681d2281e SHA-1: 1cc6935c228c609676ce36135bf6b4efa57c77c6 SHA-256: 4623c1254a43e98f62d6ea8f128368e81b38a348963b5ca33fefbb68fe8ad098
66 Risk Score

Malware Insights

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

The PDF document contains embedded script content, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. The ML classifier also flagged this PDF as malicious with a high probability. While the document body is unreadable, the presence of embedded scripts suggests an attempt to execute malicious code, likely for downloading a second-stage payload. The XFA form structure further supports the possibility of script execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9799

Heuristics 4

  • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_000002dc.bin
1e14f99a9a744e5e30090a7e010700e8a03f7d6ef3764f88a38bc87ff94acab6
pdf-embedded-script PDF decompressed stream script payload at offset 0x2DC 14232 bytes