Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea1dfca5a608b63…

MALICIOUS

PDF

12.1 KB
MD5: fbc0235a4ebdb33384772e2077eeccd4 SHA-1: 4bde840cc93bf30d3e6537d2965a742e801ebfe4 SHA-256: 4ea1dfca5a608b63fd40c7a3743abd97498d3e804130bf2e0214b206539b34d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics, including ML classification and ClamAV detection (Pdf.Exploit.Dropped-78). The presence of an embedded script payload and an embedded file suggests the PDF is intended to exploit vulnerabilities and download a secondary payload. 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
bf6bb73d4f5258bce6eaef01a77e57ad3711691270224b169dca13f819f0ef17
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11679 bytes