Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d581b09493835e6…

MALICIOUS

PDF

42.4 KB
MD5: 240e28774afe75116317c2faa3b00466 SHA-1: 955fb1219ffb9a3e43da73ad3c12b0dedff95c94 SHA-256: 7d581b09493835e6b68b46751f311c5af6e913d5aad3ddd2ba6623c26a463251
176 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier, indicating it contains an exploit. Heuristics confirm the presence of embedded script content and an embedded file, typical for PDF exploits. The embedded script likely attempts to download and execute a second-stage payload, as suggested by the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings.

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
97911ed55f0c45135c76b0c6e07a3f6a3b2a3b264eaa3c2d1d27d16b024d8106		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42695 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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