Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed8b4fece9463aa…

MALICIOUS

PDF

43.1 KB
MD5: c1cc244bd557cc377b6f61faa2cbe0d4 SHA-1: a713a18146e46e77c54fdf2f4eff8ab84951f47f SHA-256: 4ed8b4fece9463aa6f43ded9b71523690e48cff1b1f1b0e376ab8c5df5eece90
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment T1059.007 JavaScript

The PDF contains XFA (XML Forms Architecture) which is known to be a vector for exploits. High-severity heuristics indicate the presence of risky executable scripts within the XFA form, and ClamAV detection confirms this as a malicious PDF exploit. The embedded file detection further suggests it's a dropper for 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
6c6c6b9800444d66ab12207f015ce36fe41ab80013bf58a5253098e1d892f3e0		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 690 bytes
embedded_file_obj0010.bin
c259a88fa7009eac9e74e159f6844afae066e629d097960200bbbe394cbffcee		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x44A 149 bytes
embedded_file_obj0011.bin
19090334d9ec60ad24332e1d78856fbbb048d22768c91c053d16d2492001265c		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x52A 374 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6EB 190 bytes
embedded_file_obj0014.bin
53136a7e18998733e2752ebec1a8e92173e247b3df855daefb97820f8b219ae7		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x7F6 41392 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 0xA9F0 68 bytes

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