Malicious PDF — malware analysis report

Static analysis result for SHA-256 8129e75ab60ea889…

MALICIOUS

PDF

42.6 KB
MD5: 43eaa2d8622abf65bf15c53aec1f0c02 SHA-1: f184f4c0bf22dca34c380c02260dfe88beb5007f SHA-256: 8129e75ab60ea889647e15b3354f058087e7e86eb302c559f010da7988b4fba0
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 multiple heuristics, including a critical ClamAV detection (Pdf.Exploit.Agent-36830) and a high ML score. It contains an embedded script payload and an embedded file, indicating an attempt to execute arbitrary code. The embedded script, though obfuscated, appears to be JavaScript, likely responsible for downloading and executing a second-stage payload from the embedded artifact.

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
0d78fd3b7429d84672c16c84d7e2609a0356126cebc5354ec98c198902648756		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42848 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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