Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ab9a2f2e8534e1…

MALICIOUS

PDF

42.4 KB
MD5: f96ff4a80f1728dfec902f752921ac32 SHA-1: 19710d80be7ed07bdba16c4afbe6e3392cedb462 SHA-256: 87ab9a2f2e8534e1ea4f27693bd64225dbfff53b7709f8346cc4bc08b63a9fc5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: Malicious PDF

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains embedded script payloads and is flagged by ClamAV as Pdf.Exploit.Agent-36830. The presence of XFA forms and embedded files suggests an attempt to exploit PDF reader vulnerabilities. The embedded script, though obfuscated, likely contributes to the payload delivery mechanism.

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
886eb990d438c5fb3bae63d376bf2247d2ce28701cf54576c76e28f4139fcacf		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42705 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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