Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a55b26f53e4bd5f…

MALICIOUS

PDF

18.9 KB
MD5: cf4602dfc5b93888ee57172e6cc16caa SHA-1: 0acb0055ece6dabe6d74be3a5187b0a6ea1cb30e SHA-256: 2a55b26f53e4bd5f4acba1e19fcee8c43157c81cc29f9c484e23374f0f4d4086
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Exploit.Dropped-78. It contains an embedded script payload and an embedded file, indicating it's designed to exploit vulnerabilities and drop further malicious content. The presence of XFA form elements and embedded URLs suggests a potential attack vector leveraging PDF features.

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
a06eaf5eb88415f0c4de0f8b52e160b1685e7e3f12a11343c19fcb1996152b69
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18640 bytes