Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e7aa7eb81b98df…

MALICIOUS

PDF

42.7 KB
MD5: f6b73321d981040229037f8d2fa13e4c SHA-1: 3f2e27745791be18d3b39caf269297457a96c8ab SHA-256: 53e7aa7eb81b98df6c43e200ccdd3a2d30c39b4ed1771a39716de74a910a324f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: Malicious PDF

The file is a PDF that has been flagged by multiple heuristics and a machine learning classifier as malicious. It contains an embedded script payload and an embedded file, both of which are strong indicators of malicious intent. ClamAV detection confirms this, identifying the file as 'Pdf.Exploit.Agent-36830'. The embedded script is heavily obfuscated, making its exact function difficult to determine, but its presence within a malicious PDF strongly suggests it is used to download and execute 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
352c4a5b6df50c0616e6dee88dada85253d8acbe3ddaefaeb847ca80e7782665		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42983 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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