Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2bd9bfc74d2f3a9…

MALICIOUS

PDF

42.7 KB
MD5: 45ae654622a9e7b694e51352ca566a54 SHA-1: 02338b1f76b39f5d0150acedec32020a76190cd3 SHA-256: c2bd9bfc74d2f3a9dcf6f74fe16e20ce5fac670cf9abd75110c47daa8cec3f35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF file contains embedded script payloads and is detected by ClamAV as Pdf.Exploit.Agent-36830. This indicates the file is designed to exploit a vulnerability within the PDF reader to execute malicious code. The embedded script is heavily obfuscated, making its exact function difficult to determine, but the critical heuristic firings strongly suggest it's a dropper for further malicious activity.

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
dec72e955c2fa8e83a7f343e2b834d7ba6c3934f59fd87b71aa3ead4d93437e9		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43003 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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