Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bcb6d794371a636…

MALICIOUS

PDF

42.5 KB
MD5: f0c55c4ad358aab5f413601931481d65 SHA-1: a19934a7b5deebf419abb3b4d8e42ab98fe6442e SHA-256: 1bcb6d794371a63653e31bd9e69da85fd4b0dfd245649af1dc83463a764c0c1c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious File

The PDF file was flagged by multiple heuristics, including critical ClamAV detections for 'Pdf.Exploit.Agent-36830', indicating it contains a known exploit. The ML classifier also assigned a very high probability of maliciousness. The embedded file and script payload further support the conclusion that this PDF is designed to deliver a malicious 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
874b8c1b39afeb90e98aef89c94fb61d0604c804259d5c3f51dfafd369c739af		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42772 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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