Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ae7a36b7880251…

MALICIOUS

PDF

11.7 KB
MD5: a5c20006ba1510fb4dd104d7cea0aaa6 SHA-1: 09ff87aed6528a17e878d7a3f1b23472fbdc2cb8 SHA-256: 78ae7a36b78802518a2f5ec9eefd99623cc9c7cae851903d98f70cb8a20ade22
126 Risk Score

Malware Insights

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

The critical ClamAV detection and high ML classifier score indicate maliciousness. The PDF contains embedded script payloads and is identified as an exploit, likely serving as a dropper for further malicious content. The embedded URLs are not directly indicative of malicious activity, but the overall structure and heuristic firings strongly suggest a malicious PDF exploit.

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
b76be0d15fad503ebe82782c8bbb46dac8df59abc290181e7403e75ca226922c
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11268 bytes