Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b40fde1dc64e911…

MALICIOUS

PDF

42.5 KB
MD5: cb0889acb9d29b84868357478b1be7c6 SHA-1: 69d692a957221ff10d1c44fdce8245a2e82011af SHA-256: 5b40fde1dc64e911555c1a4bec972fa1ffff0b615720100db9394b47ff2e95d1
216 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains XFA forms with executable scripts, a critical finding that indicates exploitation. ClamAV detections confirm this, identifying the sample as 'Pdf.Exploit.Agent-36830'. The embedded script is likely responsible for executing the exploit, leading to the malicious verdict.

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 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
1666d3b56a6323315637611b4bd51ecb68a8f3377c047002cafad7b5d72c7078		 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
8a381c0f085d6e86a8c0578d9b9d9a3980d97fd8d69904fe60861eff1f68fce4		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x54C 384 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x717 190 bytes
embedded_file_obj0014.bin
a6ab3db81e1adfb1d58d2a0be75fd1993eddf24971950704f7d1f09ce59f6ae6		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x822 40723 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 0xA77F 68 bytes

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