Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8ffebd631e28ec…

MALICIOUS

PDF

43.0 KB
MD5: 20e05d3e69ce8512b3f1268588e9736b SHA-1: 5c31dbd51d9aa9643711a78f00e3b26f7e658911 SHA-256: 6f8ffebd631e28ec055550086a7b60db8eaa584bf07fc0ea2f6f87c19fd83c00
216 Risk Score

Malware Insights

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

The PDF file contains XFA forms with embedded JavaScript, a known vector for exploiting PDF vulnerabilities. Heuristics indicate the presence of a script payload and ClamAV detected it as 'Pdf.Exploit.Agent-36836'. The embedded JavaScript is likely designed to download and execute a secondary malicious payload, making this a typical 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
324f7b4df227e912e138087c88501c20bd023f1f61d6d012a0d275b66c328c1c		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 688 bytes
embedded_file_obj0010.bin
9b3e3137f794b4b7749fdedcd46db5dc4d1f380440711c5edf7fc00a7458da87		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x448 125 bytes
embedded_file_obj0011.bin
cb3e77bce70c5ab9c5fa62300ad3f35f3e71f09b97e2827494879e340ba1ba9f		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x510 422 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x701 190 bytes
embedded_file_obj0014.bin
0ff6d635c15cd88ec940c2e919851b0d0a99e1cf991e37c71c44966bb65cc139		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x80C 41201 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 0xA947 68 bytes

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