Malicious PDF — malware analysis report

Static analysis result for SHA-256 a585cb80396db31d…

MALICIOUS

PDF

42.0 KB
MD5: 36d6b0e47bfced5b33eabbe33ae3420e SHA-1: 93736dd60e8d701a8c73cfa1654f5b4b30f4634a SHA-256: a585cb80396db31db116f339c1456d453b42f3e9832385ab8de971e97412e1d6
186 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious. It contains an embedded script payload and an embedded file, indicating it's designed to deliver a secondary exploit or malware. ClamAV detection of 'Pdf.Exploit.Agent-36830' further confirms its malicious nature. The embedded script is heavily obfuscated, but the overall structure points to a PDF exploit attempting to download and execute 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
cd6b5aa35555fe0511e4c4be33849b17d8fd5c3d12d144bdd24e91230c06bbd9		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42237 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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