Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7a4f3befa7d63c…

MALICIOUS

PDF

42.5 KB
MD5: c07f5023fd614f33d8670ff87c01338a SHA-1: ed74969b36a98167a58d7aaacfcda225118253f7 SHA-256: ad7a4f3befa7d63cc7cdbb19f81c2e5dfc98835d75af758ab8d6a585d02a7119
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains embedded scripts and is flagged by multiple heuristics, including PDF_XFA_SCRIPT and ML_NYX_PDF_MALICIOUS, indicating it is designed to exploit vulnerabilities. ClamAV detection of 'Pdf.Exploit.Agent-36830' on both the main file and an extracted artifact strongly suggests it's a known exploit delivery mechanism. The presence of XFA forms and embedded files points to a common technique for embedding malicious content within PDFs.

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
931edb50713aba67109ff60f6473405504811a616eacc894ed642c5e15ef0899		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 687 bytes
embedded_file_obj0010.bin
97314d9231379623057a8a77eeb79f9354bacffa50753a0f63b9e87e8d67dbf2		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x447 186 bytes
embedded_file_obj0011.bin
d2804fc27dcf05904f5ce944a4483a095cc261f434c0c24a9cd7309084f5170f		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x54C 390 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x71D 190 bytes
embedded_file_obj0014.bin
3d0be325836857e56b4e43b00b8f23bf4dfde4ade1b18f6d0d826f920c629954		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x828 40667 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 0xA74D 68 bytes

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