Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed4027b20ae9ec4…

MALICIOUS

PDF

43.2 KB
MD5: bd98a5328afc051d602be34edac456e6 SHA-1: 60ed66bd30d044b488f2138d6ad009ad4b549e37 SHA-256: 3ed4027b20ae9ec48cf216eb4ad33f8b14cbbbbf9edb249207f1ddddcbe765f3
226 Risk Score

Malware Insights

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

This PDF file contains embedded XFA forms with risky executable scripts, as indicated by multiple high and critical heuristic firings. The embedded script payload is likely designed to exploit a vulnerability within the PDF reader, leading to the execution of malicious code. ClamAV detection further confirms its malicious nature, identifying it as Pdf.Exploit.Agent-36836. The embedded script's exact function is not fully discernible due to obfuscation, but its presence within an XFA form strongly suggests an exploit attempt.

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 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
0c7e5b62eb92a5f6d57306488e8370ce131f9670259ff77bd5bd9ba1049698ff		 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
525dbaf49974f38c526cb5916c42fb7bca46012331a02bde41f70b457a0338d3		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x520 354 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6CD 190 bytes
embedded_file_obj0014.bin
a7394b20100cf6f4376331b09b14e1a8fd4d012dc84299d3d42571a1e7e15193		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x7D8 41489 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 0xAA33 68 bytes

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