Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5a7b699447cd6c…

MALICIOUS

PDF

43.0 KB
MD5: 25d0bc7280e81d881cb74c9ad1ff4114 SHA-1: e1aa721eff82da20910aad1fd6f71dce549d2165 SHA-256: 4c5a7b699447cd6c4520c251a1092606917af249dcd96351b823e4baac37696a
228 Risk Score

Malware Insights

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

The PDF document contains embedded executable scripts and is flagged by multiple heuristics as malicious, including ClamAV detection for 'Pdf.Exploit.Agent-36830'. The presence of XFA forms with risky executable scripts indicates an attempt to exploit PDF vulnerabilities. The embedded script payload is likely responsible for downloading and executing a second-stage payload, as suggested by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'PDF_XFA_SCRIPT' firings.

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
2ed58507eaf1ba9c51928c7dc5f0b353a8bf400733c263eaf5595688f477c37e		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 687 bytes
embedded_file_obj0010.bin
b9dc770324ae2a66fd1d9c8b9605e3a9ddaae9d1311dffe002d37a59fdc6e4bc		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x447 183 bytes
embedded_file_obj0011.bin
c540e8f0d74affe954d6a3ce10b773f9b37ea448ce899f3b2478bd40b021c624		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x549 359 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6FB 190 bytes
embedded_file_obj0014.bin
7a61aeb7a68133f62a4a6fb02236ac6491bac88f8c35ea49cdd3f8920860dc18		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x806 41264 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
78b09463af5cd373870eae2e3e83de87b7f6b659e0d0117ab4c09d90ebb2ad95		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA980 68 bytes

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