Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd9cf4c1b6e3e3c…

MALICIOUS

PDF

42.7 KB
MD5: eac247db80bfbcbca347db05aaa591aa SHA-1: d1cd90e7969d07cfef45d95dadab44be4201821a SHA-256: 4cd9cf4c1b6e3e3c813e21cd4edcf3751605888aa2cfb14a5dd34d3f2f49a14a
228 Risk Score

Malware Insights

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

The PDF file contains XFA forms with embedded executable scripts, as indicated by multiple high and critical heuristic firings including 'PDF_XFA_SCRIPT' and 'ML_NYX_PDF_MALICIOUS'. ClamAV also detected the file as 'Pdf.Exploit.Agent-36836'. The embedded script is likely designed to exploit a vulnerability within the XFA form processing to download and execute a secondary 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-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
5cc1fb656892dbf050a74eae34c1cc9a7f489d16c8a8ddb82c73b6bade63f44b		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 688 bytes
embedded_file_obj0010.bin
50e52033eae7706a575698d3f5a6d0bf05a5f6e75efd829e6ddba4bc9dfb8167		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x448 139 bytes
embedded_file_obj0011.bin
a9e8f496030b83086db8f0f3e548773e73c5f7de935fdeb022e5a8846697a215		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x51E 390 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6EF 190 bytes
embedded_file_obj0014.bin
cdba4af57da69a49a4d3aaacd28066e964fc0fd2e4d3ce102f9022aaf00e7b21		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x7FA 40937 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 0xA82D 68 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.