Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfcd45b27e2ac83c…

MALICIOUS

PDF

43.7 KB
MD5: c8ad0cd61f55e8de5408038995ce9185 SHA-1: 7f80096f1355ce411f2433b90c7a15514c874d49 SHA-256: cfcd45b27e2ac83cdff7775822f4db68bd4ecdd3dfecb0c84f81d112a57905e6
186 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and ClamAV as malicious, specifically 'Pdf.Exploit.Agent-36830'. The presence of an embedded script payload and an embedded file strongly suggests it's designed to exploit a vulnerability within the PDF reader to execute a secondary payload. The ML classifier also returned a very high probability of maliciousness.

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
fae0c599dc9952461a8352f2fec5cc96bc02b32858ba742e54f9bc445d695c20		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 44006 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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