Malicious PDF — malware analysis report

Static analysis result for SHA-256 7552c515f40820bb…

MALICIOUS

PDF

42.3 KB
MD5: 9a74f01b4747207e7cad630300fd847b SHA-1: d7485c88cc4b28ed108701ca22a62ddd5ee844b5 SHA-256: 7552c515f40820bb8a0d11dd638bdcd0311b44e5497b44894e4751a63294266e
176 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection (Pdf.Exploit.Agent-36830) and an ML classifier. The presence of XFA forms and embedded script payloads indicates an attempt to exploit vulnerabilities within the PDF reader. The embedded script, though obfuscated, likely attempts to download and execute a second-stage payload, aligning with the 'Exploitation for Client Execution' technique.

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
a5adba2aa8fe85df2e6ef72dc649a8fc27cd56e581d2f176438e37a64353c7c4		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42570 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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