Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff5487124e88661…

MALICIOUS

PDF

42.8 KB
MD5: c2e540b2a336b0e58de4a3bb452dd13f SHA-1: caf317acceecf0acfd7b8bb12635b4791319b9b0 SHA-256: dff5487124e88661468c625d7cec8adae873ed61c2e9580f98def5d749716525
186 Risk Score

Malware Insights

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

The PDF was flagged by multiple high-confidence heuristics, including ML classification and ClamAV detection, indicating it contains malicious content. The presence of embedded script payloads and an embedded file further supports its malicious nature. While the document body is not directly readable, the heuristics and embedded artifacts strongly suggest an exploit attempt, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36830 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36830
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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
5aaf40864a17b8945484a269468600c7ad612ae38a261890babd228c4942313e		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43118 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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