Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb8b1b83926d6ba…

MALICIOUS

PDF

43.0 KB
MD5: 8124ddba06274ea9acdedb1e88974fff SHA-1: 2def984be6aaf3323e5be05c720783c919eef02b SHA-256: fdb8b1b83926d6badda9a8724831b38b65705398658f09fe97d7f14e4150f9b2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV with the signature Pdf.Exploit.Agent-36830. It contains an embedded script payload and an embedded file, indicating it is designed to deliver a secondary malicious artifact. The embedded script is heavily obfuscated, making its exact function difficult to determine, but its presence alongside the embedded file strongly suggests a payload delivery mechanism.

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
b85a077d207acc149322ec02bf25ef60e50cdaf0ad24b370b5b2d6e29dc6c05f		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43229 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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