Malicious PDF — malware analysis report

Static analysis result for SHA-256 f274d4e111eaf84b…

MALICIOUS

PDF

42.7 KB
MD5: aa69a012c1bc67a0884f0a63e5350adf SHA-1: c4d08493bd362372a2a377b45e156eb70e9f1734 SHA-256: f274d4e111eaf84b61cc7873fa9976c4d3aeb1b5c9147f76d2804e6c5ac316ea
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

This PDF document was flagged as malicious by multiple heuristics, including critical ClamAV detections for 'Pdf.Exploit.Agent-36830'. The presence of XFA forms and embedded script payloads strongly suggests an exploit attempt. The embedded script is likely responsible for downloading and executing a second-stage payload, though its exact functionality is obscured. The ML classifier also provided a very high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • 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/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
0a2224c4023b216235b61c3fc4dd17bbfac1ab23a545687f51b97604cf654712		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xD7 46 bytes
embedded_file_obj0009.bin
c3289af07570ed5680daf13036b41a38b097192bf66621832317607a0f829bb3		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 687 bytes
embedded_file_obj0010.bin
982e20dbb278e7bb9167a49d41bca4eba40d0f35d12088fdf01e6cb6fead89b4		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x447 165 bytes
embedded_file_obj0011.bin
df7ded70f215e1702ab860872397f12b6b9c796fe92b2503ea57aa4105757df6		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x537 427 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x72D 190 bytes
embedded_file_obj0014.bin
64e85ae2343a0a25339dc22c207d15a6b3c6c4a8ae663e6847d1b7832a23d45f		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x838 40860 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
78b09463af5cd373870eae2e3e83de87b7f6b659e0d0117ab4c09d90ebb2ad95		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA81E 68 bytes

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