Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bb5aa037dccb07…

MALICIOUS

PDF

11.9 KB
MD5: efb10ee85b289035e58f27af5e552d0a SHA-1: 513f1b16203c495d7b662a8a2120786becb4e2ab SHA-256: b8bb5aa037dccb07f19d8d511df29f2fc26e0278140c0fafb553eea1fdf670cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV (Pdf.Exploit.Dropped-78) and a machine learning classifier. Heuristics indicate the presence of an embedded script payload and an embedded file, suggesting it's designed to exploit vulnerabilities upon opening. The ML classifier output of 0.999995 further supports its malicious nature. The embedded URLs are not directly indicative of malicious activity, but the overall structure points to a typical exploit-based PDF.

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
d8c105eac3dbc2c145465230c9b50c82d205ea814b858b078f4e8fe5078c0c18
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 11385 bytes