Malicious PDF — malware analysis report

Static analysis result for SHA-256 45999e46b5b48e72…

MALICIOUS

PDF

42.3 KB
MD5: 04d2319868a3e53efe4753d1ea5c4587 SHA-1: 72ecf25139b69c0298fd0c4b0568db2ac0d9d6c4 SHA-256: 45999e46b5b48e72f5f9de5f8d974d7898a05cf916ffd6236ca02beb04e8cf0b
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics, including ClamAV detection as 'Pdf.Exploit.Agent-36830' and a high ML classifier score. It contains an embedded script payload and an embedded file, indicating it's designed to deliver malicious content. The presence of XFA form elements and embedded URLs further supports its exploit-oriented nature. No specific script content was readable, but the overall structure strongly suggests an exploit attempt.

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
1899b2aa9da22e936646cdd09a044b1f45e667cdf5f2f5866d51fc14240588db		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42597 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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