Malicious PDF — malware analysis report

Static analysis result for SHA-256 80173948e923438d…

MALICIOUS

PDF

42.5 KB
MD5: 2f046b240e557dbc9cc5a7297f66198f SHA-1: 158d2f4c5affdbca7d9d5285e56e15ec0c98f280 SHA-256: 80173948e923438dc9fd38367ad264664d19fd1f5cbfe2ad9cad0a4738ffdedd
176 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating it contains an exploit. The presence of an embedded script payload and an embedded file suggests the PDF is designed to download and execute a second-stage payload. The embedded JavaScript, though obfuscated, is likely responsible for triggering the exploit and initiating the payload download.

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
908c87b419365679a5a0bd549ceb09a094302f66b84217e70f8f47115b3506b4		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42730 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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