Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78a5ee58d5f51c2…

MALICIOUS

PDF

42.8 KB
MD5: 70ba466ee26552a6545dcd5ba73a67a0 SHA-1: 66e64922b4daced6977734ab93ba31661ca2d10f SHA-256: c78a5ee58d5f51c2344996a010f19e58fece67a9414d1f4fbf21cfc72941068c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF file contains an embedded script payload, as indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic. ClamAV detection confirms this as malicious, specifically identifying it as Pdf.Exploit.Agent-36830. The embedded script is heavily obfuscated, making its exact function difficult to determine, but it is likely responsible for downloading and executing a second-stage payload. The presence of XFA forms and embedded files further supports the exploit delivery vector.

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
2b6a9805eb6d1c603a598458242caf6008cd1abe74492e755b8514580508ea70		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43047 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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