Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d0a67f5d03e4af…

MALICIOUS

PDF

42.3 KB
MD5: 1bb8a0ba5be6e950c62ccab1198d3da5 SHA-1: 8b7e34c6da4991b114c796ad6ed79dcd384d879d SHA-256: 03d0a67f5d03e4af397a7c5d8eecaf479d88a020ee0b163cb68659ff02713479
176 Risk Score

Malware Insights

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

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 scripts and an embedded file, typical for PDF-based exploits. The embedded script, while obfuscated, likely attempts to download and execute a second-stage payload, aligning with the 'Exploitation for Client Execution' technique. The overall pattern suggests a spearphishing attachment used to deliver malware.

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
cc5d86554a7ac8f02440c5bc1df05a0190d69d0bc15c24cec974c42ce4ccbaec		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42605 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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