Malicious PDF — malware analysis report

Static analysis result for SHA-256 1975abf575417341…

MALICIOUS

PDF

42.9 KB
MD5: 4dbb4ad9a4bb3be13eaff06b1f174ded SHA-1: 2d26ff8213029e9fe4b3908f7f4e49b7a3f95956 SHA-256: 1975abf5754173410cdb223bca5d1b1d1e92dcd267fdfb62fed29a6ce965f5d4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is a PDF document flagged by ClamAV as Pdf.Exploit.Agent-36830, indicating it contains an exploit. Heuristics confirm the presence of embedded scripts and an embedded file, suggesting the PDF is designed to execute malicious code. The ML classifier also strongly indicates maliciousness. While the specific exploit mechanism is not fully detailed, the presence of embedded JavaScript and an embedded file points towards a client-side exploitation attempt.

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
4f03f8ce31581a172ff18b4e5d85c38b2e7ca914f5660ba474272bf696177580		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43164 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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