Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f3335ff430f5fd…

MALICIOUS

PDF

42.5 KB
MD5: 661cef4a01844c9eede200f11878f053 SHA-1: d92b3eef394f631ed231bf3055b7c30bf8b98370 SHA-256: f0f3335ff430f5fd5edd46b886cface9a168221260bcc6bcb13fa23004f04efa
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV with the signature Pdf.Exploit.Agent-36830. Static analysis revealed embedded content, including a script payload and an embedded file artifact. The embedded script is heavily obfuscated, making its exact function difficult to determine, but its presence alongside the embedded file strongly suggests it is used to download and execute a second-stage payload. The URLs extracted are related to XFA forms and are not directly indicative of 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
75bcc06c02bc727f908cc0f696cd81c5e17f690305e3f292ec2f84539eb25656		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42798 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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