Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbc22f3d6553b2e…

MALICIOUS

PDF

42.6 KB
MD5: a6711915758ff6a7f002c96014e18e04 SHA-1: 97eef3ab88b8d93a62d1bc7ca65c2d69a0133b81 SHA-256: 5cbc22f3d6553b2e43db0aa5c2e6b3acdab2f544854ce6c39177076d5cb310fe
216 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF document contains XFA forms with embedded JavaScript, a common technique for exploiting PDF vulnerabilities. Heuristics indicate the presence of risky executable script within the XFA form, and ClamAV detection confirms this as a known exploit (Pdf.Exploit.Agent-36836). The embedded script likely downloads and executes a second-stage payload, characteristic of a malicious document delivered via spearphishing.

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 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
2f136ae8688b46e7e3066dfca9d2ee662ba3b3c334708da345508efd0bb68ed8		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 686 bytes
embedded_file_obj0010.bin
50e52033eae7706a575698d3f5a6d0bf05a5f6e75efd829e6ddba4bc9dfb8167		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x446 139 bytes
embedded_file_obj0011.bin
6594cfbaa289de20263cdec8bba927f89c8ca37bccb00b9ec9bddfeee75b0c8f		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x51C 356 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6CB 190 bytes
embedded_file_obj0014.bin
25e94e3a169dbe5941e6534baf7cbe7ecb2207f96017ea9affdb657c2822ba84		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x7D6 40896 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 0xA7E0 68 bytes

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