Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca9302ef305ff5a…

MALICIOUS

PDF

42.7 KB
MD5: 2844dbc0e0bf687db24deed2ed0ace1f SHA-1: 8ce2c4f84044252262b96dc69ae73ca845e4781f SHA-256: bca9302ef305ff5abbbcde7611e66b5d44be2981d5661b5afacc594a35d6d988
228 Risk Score

Malware Insights

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

The file is a PDF document identified by ClamAV as Pdf.Exploit.Agent-36836, indicating it contains an exploit. High-severity heuristics confirm the presence of risky executable script within an XFA form, suggesting it's designed to execute a payload. The embedded artifacts and the ML classifier further support the malicious nature of this PDF.

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-36836 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36836
  • 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
26cba0913a143e8db11bc6f97108e211fb97cd33596e76835a5f946126ef4ed8		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 688 bytes
embedded_file_obj0010.bin
9b3e3137f794b4b7749fdedcd46db5dc4d1f380440711c5edf7fc00a7458da87		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x448 125 bytes
embedded_file_obj0011.bin
63a30a87789c4f5588340151136395a4830b8cf9f7e36c14aa13a3f8926e7948		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x510 385 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6DC 190 bytes
embedded_file_obj0014.bin
ec63d70fbb657a7b6e651e7609002fb69fd8561b03d3ab61ba30cad3eba79cf0		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x7E7 40957 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36836
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
78b09463af5cd373870eae2e3e83de87b7f6b659e0d0117ab4c09d90ebb2ad95		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA82E 68 bytes

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