Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43620e7c2dc348d…

MALICIOUS

PDF

42.4 KB
MD5: 79ca7deb3ded9dbc675d1cabed729046 SHA-1: 4b47a86090ecc9fe1a57589a09ba63c25446bb65 SHA-256: b43620e7c2dc348deb2983aec6422720d9d066b81b615d399bb62ae1419514a3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1059.007 Abuse Execution: JavaScript

The PDF file contains embedded XFA forms with risky executable scripts, as indicated by multiple high and critical heuristic firings. ClamAV detection confirms this as a known exploit, specifically 'Pdf.Exploit.Agent-36830'. The embedded script payload is designed to be executed when the PDF is opened, likely leading to further malicious activity.

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/

Extracted artifacts 6

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
2ba2859c24634e28a3e26195b191c71ac0b7c54c29fc85346e3ddf634667204f		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 689 bytes
embedded_file_obj0010.bin
de913a067c1e5a47831f1eba0ee72b663ccd0a38727b4b1cba1f8d6e7ca84cda		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x449 165 bytes
embedded_file_obj0011.bin
0c8c40ac0a16ee4e4ab5abe478260d634b441a8ed3375cc034dff44622dc7049		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x539 421 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x729 190 bytes
embedded_file_obj0014.bin
237ba76b49b45e1e1937afd97500c9459a221f52bee45be415955bf6f03207ae		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x834 40677 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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