Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b412986b87d522…

MALICIOUS

PDF

42.3 KB
MD5: 6539fe14f479fb827d71470d124cfa6e SHA-1: 779b4792082740d8745c0f484071c6e1bdb828f8 SHA-256: 05b412986b87d522782aa2cc45a133abc689121a347ae6e85e39a50a6b7dd837
176 Risk Score

Malware Insights

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

The PDF file contains embedded script content and is flagged by ClamAV as Pdf.Exploit.Agent-36830, indicating it exploits a known vulnerability to execute a payload. The embedded script, though obfuscated, is likely responsible for the exploitation and subsequent payload delivery. The benign URLs present are part of the XFA form structure and do not appear to be malicious.

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/xci/1.0/
    • 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
26a6f3763f79bfdd157bdd5e4d241f4c4cd1d4a2e267222f516562405d95cc9b		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42569 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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