Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e3e05f276d9f02…

MALICIOUS

PDF

42.4 KB
MD5: d1df6c21c0cb8e344ea6465bf53ccb75 SHA-1: 4d48fb025192e0002bafc7d9c31c650c036d4464 SHA-256: b1e3e05f276d9f028cdbc87c1e04372e0700af4706ae24a5e82d9256d27e1f63
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter

The PDF file contains embedded executable scripts within its XFA form structure, as indicated by multiple high and critical heuristic firings including PDF_XFA_SCRIPT and ML_NYX_PDF_MALICIOUS. ClamAV detection of 'Pdf.Exploit.Agent-36830' on both the main file and an extracted artifact strongly suggests it's a known exploit. The embedded script is likely designed to download and execute 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/
    • 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
92d5bfb47c0a2ff41737c977429763382a6fe242a75bf5e932f022be59aaaae5		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 687 bytes
embedded_file_obj0010.bin
97314d9231379623057a8a77eeb79f9354bacffa50753a0f63b9e87e8d67dbf2		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x447 186 bytes
embedded_file_obj0011.bin
6f560d5d1046ecd065af4f3a12bbe5be916c12114bc27fcb1915df7e7bbec4b0		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x54C 389 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x71C 190 bytes
embedded_file_obj0014.bin
b1d5b244f78d4475a8eff95a0f54e57c06d40d4157e686e87bc9e57fbdd218c8		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x827 40540 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 0xA6CD 68 bytes

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