Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8c04a27232109e…

MALICIOUS

PDF

15.2 KB
MD5: 3023ace1f7def0ebc6226143be87f2a8 SHA-1: 41aa17c43c0f90a738e098643bdda3c1be32a8d7 SHA-256: ae8c04a27232109e680e711a0c6a604ea880bbe31fe68499d3ba3db16e646bb9
126 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection (Pdf.Exploit.Dropped-78) and a high ML classifier score. The presence of an embedded script payload and embedded file strongly suggests it's designed to exploit PDF vulnerabilities and drop 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
cfbfb4d3e67705d7f932ec0f88dc773c7c1edd4231666d4ec1f57ec5db277459
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 14825 bytes