Malicious PDF — malware analysis report

Static analysis result for SHA-256 845c9de998d97d24…

MALICIOUS

PDF

42.6 KB
MD5: c3fe65a30af98300f0df52de6fc82bce SHA-1: 07f03c084048f814386c7af5c23c187824807008 SHA-256: 845c9de998d97d2400f708dc4a4e1355871502c6674705305ed399941f6998f5
216 Risk Score

Malware Insights

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

The PDF document contains XFA forms with executable scripts, a critical finding indicating malicious intent. ClamAV detection confirms this, identifying the sample as Pdf.Exploit.Agent-36836. The embedded script is likely designed to exploit a client-side vulnerability, leading to further malicious execution, consistent with a spearphishing attachment.

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 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/
    • 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
3b92fe3a6c03862f02e5bf1c2cc7098f941a2029cfa735a2209a7c6fe9e04010		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 690 bytes
embedded_file_obj0010.bin
50e52033eae7706a575698d3f5a6d0bf05a5f6e75efd829e6ddba4bc9dfb8167		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x44A 139 bytes
embedded_file_obj0011.bin
2306824cf0d655dfdb5b77d3b5c49860a7b3b6f8cd520e402ab22b7b908be178		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x520 391 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6F2 190 bytes
embedded_file_obj0014.bin
45d0f955767b74d1703dc70c9f333bd892a0ef23e764cf4f562356c59b7f6a98		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x7FD 40811 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 0xA7B2 68 bytes

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