Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28d31a13ac1add3…

MALICIOUS

PDF

11.8 KB
MD5: 30aa52838bf3cabc4306fec42aaf5893 SHA-1: a38e83d2a0d2b50fe3fbf4fbe25967482d7848bb SHA-256: f28d31a13ac1add3980bbc3cac845d2d5dec7a9edb8f91497bcc0da045dedf48
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV with the signature Pdf.Exploit.Dropped-78. High confidence is derived from the ML classifier's score of 0.999995 and the critical ClamAV detection. The PDF contains embedded script payloads and embedded files, indicating it is designed to deliver a secondary exploit or malware.

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
9bb52e0fe42e1380643a6c9cd0ba723eddc26078893cc27f9ffd6e63ddd80090
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11335 bytes