Malicious PDF — malware analysis report

Static analysis result for SHA-256 784e8e04ad99bcca…

MALICIOUS

PDF

42.6 KB
MD5: c642784c3b8ae448de52b2fde2f7616b SHA-1: a49e765fcc124eed900f7ba04a6fddc811594dfc SHA-256: 784e8e04ad99bccabae9b80f5d1602536b9522cee3ab0732d39d1a2c142e1e24
216 Risk Score

Malware Insights

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

The PDF document contains embedded JavaScript, flagged by multiple heuristics as risky and malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit a vulnerability and execute a payload. The embedded JavaScript is designed to download and execute a second-stage 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 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
1e0842d4db880918deec139a20fedcd1e86b4b693727946d31893a0e53e0c6eb		 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
0694cbaefe19917f4e6d2f59a4c8a4b696ffd0f7ba6b849a5f8303f2f7c96f4b		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x51E 393 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6F2 190 bytes
embedded_file_obj0014.bin
a7ec0c8436e65ca6bcfac5eca8c1de52cd0d1082970b5cc318f2bcc8a6a70a38		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x7FD 40787 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 0xA79A 68 bytes

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