Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a3e7711a868808…

MALICIOUS

PDF

42.8 KB
MD5: 26959b8533474ef9b9b09d2b45aabd5c SHA-1: 636d3823f74ebb8e2a658f47c5ddaadb54c2a986 SHA-256: c6a3e7711a86880867794e3551f5fe003f257903c685d9a9e3a82afe3fd90200
228 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a high-severity XFA form with executable script, flagged by multiple heuristics as malicious. ClamAV detection confirms this, identifying the sample as 'Pdf.Exploit.Agent-36830'. The embedded script payload is likely responsible for executing the malicious activity, potentially downloading and running 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-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
1c4469db253291a612740c65c0b4770bc203f8a04f185f799bdedfccdc928feb		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 687 bytes
embedded_file_obj0010.bin
de913a067c1e5a47831f1eba0ee72b663ccd0a38727b4b1cba1f8d6e7ca84cda		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x447 165 bytes
embedded_file_obj0011.bin
ea52f1cec2a5a492397f9ebc66a8610489bf587128adb9d0e56e4b2f30009263		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x537 427 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x72D 190 bytes
embedded_file_obj0014.bin
b2c819aa950d4d5df3cc4c392b676638302b77048f93d28371a9822fb7275584		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x838 40990 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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