Malicious PDF — malware analysis report

Static analysis result for SHA-256 b573e6ef211f6322…

MALICIOUS

PDF

11.7 KB
MD5: a2fc82fc87974695a84975375d02c4bc SHA-1: 8296e04c0f09031bd9dec1fa2e7e776c4347f18c SHA-256: b573e6ef211f632295428562e404732998857aef3b511961bf7356bdfe2ef885
126 Risk Score

Malware Insights

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

The critical ClamAV detection and high ML classifier score strongly indicate malicious intent. The PDF contains an embedded script payload, suggesting it is designed to exploit vulnerabilities upon opening. The embedded file and XFA form further support this, pointing towards a dropper or exploit delivery mechanism.

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
674ae4d22af9cb6e88d44d465564cf9be631ed8a62ceebdb04b5a48b4e5b1793
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11247 bytes