Malicious PDF — malware analysis report

Static analysis result for SHA-256 882d559b6d73298e…

MALICIOUS

PDF

42.4 KB
MD5: a2307568e232f8914bf0e46be1b6b478 SHA-1: 9c6c1de29199ad91673d239f0426dd9c7c9599a8 SHA-256: 882d559b6d73298e628328ac38a0f7f0078002d4390c480e0a8f51d5a80a7ffd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample was flagged by multiple heuristics, including critical ClamAV detections for 'Pdf.Exploit.Agent-36830', indicating it contains an exploit. The presence of embedded script and an embedded file further supports this. The ML classifier returned a very high score, suggesting a high likelihood of malicious intent. The script's obfuscated nature and the embedded file suggest it's designed to download and execute a secondary 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 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 script payload in PDF stream low 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 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
1b658167d98ee2d585f8820ef0743bf6bb3a615b731c54bf9fc1a48a577bce4a		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42675 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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