Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91d2affac09bccf…

MALICIOUS

PDF

42.6 KB
MD5: 3a1c06c86f33a3af5c09df7cbdde4936 SHA-1: 19c611135e9f84fa152534c2516075868e231efd SHA-256: e91d2affac09bccfb587787fd3a631fcd53b09bb5725f0bdf032fdf5b22628c5
186 Risk Score

Malware Insights

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

The PDF exhibits multiple high-severity heuristic firings, including embedded script payloads and ML classification indicating maliciousness. ClamAV detection as 'Pdf.Exploit.Agent-36830' strongly suggests it's an exploit-based document. The embedded file and script point towards a downloader or exploit delivery mechanism, aiming to execute further malicious code. The document body content is highly obfuscated and appears to be part of the exploit or script execution rather than user-facing text.

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
15baed4e77e5820c72df1a2e44195f09f9a52e61f85d06e89ee8b3313ed09825		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42845 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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