Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3c39e489842aab…

MALICIOUS

PDF

43.1 KB
MD5: 9fbd6f58f391d23059a3803ff468799f SHA-1: aa907d79b577676595b7cdf960d765bbeb53ddbf SHA-256: 8a3c39e489842aab74ce08cd801dfaaa9b32d20c4adfe53916303c44c35f8220
226 Risk Score

Malware Insights

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

The PDF file contains embedded executable scripts within an XFA form, a known technique for exploiting PDF vulnerabilities. ClamAV detection of 'Pdf.Exploit.Agent-36830' on both the main file and an extracted artifact strongly indicates malicious intent. The embedded script is likely responsible for delivering the exploit payload.

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
815417e4e9a29ed07dec8ee238b140217ef5d41b6f16105dad9ca9719e83effc		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 685 bytes
embedded_file_obj0010.bin
97314d9231379623057a8a77eeb79f9354bacffa50753a0f63b9e87e8d67dbf2		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x445 186 bytes
embedded_file_obj0011.bin
2fcc61c83291c1a829b6667d6fc8662c8c85543da1002ad8a7790bba63cba37d		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x54A 388 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x719 190 bytes
embedded_file_obj0014.bin
abf58c3c0696565851a5aeb0376bc7132d1b98f729e4e2105d587b58473687c4		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x824 41321 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 0xA9D7 68 bytes

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