Malicious PDF — malware analysis report

Static analysis result for SHA-256 8133dba3cde465bb…

MALICIOUS

PDF

42.7 KB
MD5: da35b92239d1044e62ffa4d65bbea5cd SHA-1: cb03fecacfd82069b8454123ee3295c03b2c6b73 SHA-256: 8133dba3cde465bb6081c2d37c23f1b97d5169c52010cec9e6676bbaafd66082
176 Risk Score

Malware Insights

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

The PDF document contains embedded JavaScript, flagged by heuristics as a malicious script payload. ClamAV detection of 'Pdf.Exploit.Agent-36830' on both the main file and an extracted artifact strongly indicates exploitation for client execution. The embedded JavaScript likely attempts to download and execute a second-stage payload, though its exact function is obscured.

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
dccf7443445309a6616b0edc3a3370e949f03b345cc216000e83511494d859d9		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42932 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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