Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca93174e267f2151…

MALICIOUS

PDF

42.5 KB
MD5: 13f54f31c60b12b7b9f2c9e403b2bdcf SHA-1: 3d7f56820eaaef589791f2cea2d47e8946dac2ff SHA-256: ca93174e267f21512b1156df27fac170aa55c9baccf3bf2e30d78b3a07dd34fd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The PDF file was flagged by multiple high-severity heuristics, including ML classification and ClamAV detection, indicating it contains an exploit. The presence of an embedded file object and an embedded script payload further supports this. The embedded file, 'embedded_file_obj0008.bin', is likely the delivered payload.

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 script payload in PDF stream medium 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 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 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
a752c94e876310b18d2d37697df3cbbaf6e3e9682d84d5470aaa929414456664		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42768 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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