Malicious PDF — malware analysis report

Static analysis result for SHA-256 31481f9b6de79847…

MALICIOUS

PDF

11.8 KB
MD5: ebf66ba5c715469d1470342be4b29ac5 SHA-1: 941116135e666059ccdf96cdc09d530060f360ae SHA-256: 31481f9b6de79847e9af91f38e026df0480bbe10ab51f600ce732935b7d2a15a
128 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 score. The presence of an embedded script payload and an embedded file strongly suggests it's designed to deliver a secondary exploit or malware. The embedded URLs, while not directly malicious, are associated with PDF forms (XFA), a common vector for exploitation.

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
f603363dde45141a0093e3ad6a233cb50b5633e7801afc9ca28d2a70619f2b16
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11310 bytes