Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e74634efb330b1…

MALICIOUS

PDF

42.1 KB
MD5: c46d3fa311610e76b02607eadf9fce1f SHA-1: 65a0fd113ca1d40902e522ed873a3d1210cb1645 SHA-256: 77e74634efb330b148909623aa70545a9b0b8602da8e3b2637296c99aee4ce28
176 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier, indicating it likely exploits a client-side vulnerability for execution. The presence of embedded scripts and an embedded file further supports this, suggesting it's designed to download and execute a secondary payload. The benign URLs found do not detract from the malicious nature indicated by the critical heuristics.

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
57e9e60259fadda78a3f753d169f5b818063d8f27d69370538de9eb4fbc04d0b		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42327 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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