Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3a84bcd4fa06e1…

MALICIOUS

PDF

42.9 KB
MD5: e3a9ec5f6933262557ffa55339ffe1c1 SHA-1: 5bb4f8de59448803aa95bc601df1cf8aabe90587 SHA-256: 4c3a84bcd4fa06e190ff39c5030aa0d22dcf0732fc1cbf5464c31ab3b35bed2c
188 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as 'Pdf.Exploit.Agent-36830'. The presence of an embedded script payload and an embedded file suggests it is designed to exploit vulnerabilities within the PDF reader to download and execute a secondary payload. The document body contains obfuscated JavaScript, further indicating malicious intent.

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
d4db7cab702ec2721813771352a52ae33ef2acc9e777154377b75bc081686f66		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43219 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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