Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d54f585dc62e867…

MALICIOUS

PDF

2.1 KB
MD5: 5a4b0473c001bd38b482b8262e82a7dc SHA-1: a1b06517272b4cb5a96b4b5debaf0fd456d23348 SHA-256: 5d54f585dc62e867f800507e29219dbfddd9ab4b758b4b5448785e59d7aef9ec
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious File

This PDF document contains JavaScript that uses the `exportDataObject` and `nLaunch` functions to save and execute an embedded file. The embedded file is the EICAR test signature, which is a standard method for testing anti-virus software. The primary intent appears to be to trigger an anti-virus alert or test the security controls by presenting a known malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • exportDataObject + nLaunch — embedded-file launch-on-open dropper critical PDF_JS_EXPORT_LAUNCH_DROPPER
    PDF JavaScript calls exportDataObject() with nLaunch set, which extracts the document's embedded file and launches it in its default application. This is a launch-on-open dropper: the embedded file is the payload. No benign workflow auto-launches an extracted PDF attachment.
  • ClamAV: Pdf.Dropper.Agent-7264341-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7264341-0
  • 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.
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
EICAR.txt
275a021bbfb6489e54d471899f7db9d1663fc695ec2fe2a2c4538aabf651fd0f		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x62C 68 bytes
Detection
ClamAV: Eicar-Test-Signature
Obfuscation or payload: unlikely
javascript_obj0008_000.js
c79586b6ce33258a4a3246f592054a0720afaa39e08ec5d2fa6c2c1d19c42b91		 pdf-javascript-stream PDF /JS object 8 at offset 0x4FF 58 bytes
javascript_obj0008_001.js
a99f0aad140b19a3f2f03812ca412c6d983fae48b9344738a95bf360fb8f644c		 pdf-javascript-stream PDF /JS object 8 at offset 0x4FF 56 bytes
combined_document_js_000.js
199ba6b6d17851b5ae7a01a409ca7b2ee3b1ed01f3e9b137a2572738cc785da4		 deobfuscated-js combined document JavaScript streams at offset 0x4FF 115 bytes

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