Malicious PDF — malware analysis report

Static analysis result for SHA-256 c591d4d57209fe14…

MALICIOUS

PDF

42.9 KB
MD5: bed7384702271d56333fc0ba5f2cb4fb SHA-1: 02554da8abe43fd820b10b8c7c9caf55b9c5346f SHA-256: c591d4d57209fe14ccf29143e0684a5f0dd9ef9977d59f44db016b40b45af35a
226 Risk Score

Malware Insights

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

The PDF file contains a high-risk XFA form with executable script, flagged by multiple heuristics and ClamAV as Pdf.Exploit.Agent-36830. This indicates the file is designed to exploit a vulnerability within the XFA processing engine to execute a malicious payload. The embedded artifacts and the ML classifier further support the malicious nature of this document.

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/
    • 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
ec3efb35f45527e5e254138b745d31ad0f84d3197d87b2f6b55a8af9aafadbba		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 687 bytes
embedded_file_obj0010.bin
65e0cd26724bbac83c6001dfbee5727d8d7dc958f364f02a819dd2cf25ba393a		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x447 160 bytes
embedded_file_obj0011.bin
76e83172f6eb408ce55f730383148cb5f295eaa475da687353f44826834511be		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x532 423 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x724 190 bytes
embedded_file_obj0014.bin
61d51dd0a40c8a15b634e2ccbc00c5215b34da94757e402f1c7084a1c274a427		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x82F 41048 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
03172373f36e220deaea3baf69186e2a8bef99633879227f39b2a0b4510201ee		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA8D1 138 bytes

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