Malicious PDF — malware analysis report

Static analysis result for SHA-256 0129540550651c85…

MALICIOUS

PDF

12.0 KB
MD5: abd53ab0bdef4dfd6ce1c49407539532 SHA-1: 1502ee9b146007160ba4567f8028f64de8687b4b SHA-256: 0129540550651c854af636c1c1aeccc2107055820e8944a675d7c8847dfa0136
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The PDF file contains an embedded script payload and was flagged by a machine learning classifier and ClamAV as malicious. The presence of XFA forms and embedded files suggests an attempt to exploit PDF vulnerabilities for delivering a secondary payload. The embedded URLs are likely part of the exploit chain or lure.

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
189af4954b10b6cef8bdb2f4ca12ce7b455c5a2eabe11094c02a583c03642d7a
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11568 bytes