Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8df383d0ac66433…

MALICIOUS

PDF

42.7 KB
MD5: 9a2f4820ef156ccfb777e5668792b570 SHA-1: d3494777cd31974cefb6df7d0e4f44ae77cbbbe3 SHA-256: a8df383d0ac6643320993cebb172fc853f7f08ddebbfaf529de7c52d356fe20c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious PDF T1566.002 Phishing: Spearphishing Attachment

The file is identified as a malicious PDF by multiple critical heuristics, including ClamAV detection (Pdf.Exploit.Agent-36830) and an ML classifier. The presence of an embedded script payload and an embedded file further indicates malicious intent. The PDF structure and embedded content suggest it is designed to exploit vulnerabilities, likely leading to the download and execution of a second-stage 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
8f30735069dc4eaa2965742e421262ef0ebf5cc16089009f37b311ffb3e7aca4		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42996 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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