Malicious PDF — malware analysis report

Static analysis result for SHA-256 405ea65a0eb53255…

MALICIOUS

PDF

12.0 KB
MD5: f76f8256dda824ef3d76a90b2d823356 SHA-1: 199caf34c573798909842546b007b747f4a6a5f8 SHA-256: 405ea65a0eb532553285361508462a6d8f851d5e8ff1d632e65b130aa5b114a2
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection (Pdf.Exploit.Dropped-78) and a high ML score, indicating it contains an exploit. The presence of an embedded script payload and an embedded file further supports its malicious nature. The document body is not readable, but the combination of PDF exploit indicators and embedded content suggests it's a delivery mechanism for a secondary payload.

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
44e923b2b2a4aab89c04862b877e8a78a7c900c817e6d2dc4ad6e4ceb05f4b4f
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11482 bytes