Malicious PDF — malware analysis report

Static analysis result for SHA-256 6445837f4d488bd0…

MALICIOUS

PDF

42.8 KB
MD5: 452b4d5a4bbbd7c4f99046901ba99978 SHA-1: 63118d754ecc4b7e7be89db17e8b780469264c19 SHA-256: 6445837f4d488bd0ebc8fe222023cb70ff24c4a6f2d6faf0cc2785223e3619b3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded scripts and embedded files, indicating an attempt to exploit vulnerabilities and deliver a secondary payload. The presence of XFA forms and embedded scripts suggests a common technique for client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36834 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36834
  • 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 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 script payload in PDF stream low 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 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
df49b83037618f0a1ef56a2711f0a9393dde10f38c9f6e4df8b71ee021a09a17		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 686 bytes
embedded_file_obj0010.bin
1870a8c90be73ebe36ae508f57c55ef58407515a4ad8c7e867914369cf2923c9		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x446 99 bytes
embedded_file_obj0011.bin
8619cff1a1159c512dcb176e6caf1d9fc21983b6a5f62bbddfba440df89d952a		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x4F4 571 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x77A 190 bytes
embedded_file_obj0014.bin
794c51d9e572c322c8f3929215f6ce80095985a6dde8d83d4375ca92858702bd		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x885 40948 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36834
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
78b09463af5cd373870eae2e3e83de87b7f6b659e0d0117ab4c09d90ebb2ad95		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA8C3 68 bytes

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