Malicious PDF — malware analysis report

Static analysis result for SHA-256 875cc7e1a9a10283…

MALICIOUS

PDF

42.3 KB
MD5: e89fd24bb0e1c8b47f6bfe1d0b133b35 SHA-1: e5e8effd8e92cbd983578c56a811b2c792e592e5 SHA-256: 875cc7e1a9a10283644e968649635050de0dc4a6993e635ac0235b4acb6764f2
216 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains XFA forms with executable JavaScript, a common technique for exploiting PDF vulnerabilities. ClamAV detection of 'Pdf.Exploit.Agent-36830' further confirms its malicious nature. The embedded script likely downloads and executes a second-stage payload, leading to the exploitation of the client execution vulnerability.

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 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/

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
e3d938a451e9743d1d3484905e4d9c2194f1eb5cee9819c985c7cb3ab53bae0d		 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
a7f28bd7bb4f2f4d524c6d79f6d6ce7c05ddc2007e85108f080045a369646d12		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x537 417 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x723 190 bytes
embedded_file_obj0014.bin
c3a2dbdb9bccd47591bdc43589e5885874a2ac9a14e286045e47c9dd6ab82363		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x82E 40517 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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