Malicious PDF — malware analysis report

Static analysis result for SHA-256 6216ec42c07357aa…

MALICIOUS

PDF

2.1 KB
MD5: 89592bd12810a18088b9a6c71da5a5f0 SHA-1: 3fbc87b33838bba57467e2a4c989849aa00b671e SHA-256: 6216ec42c07357aa15937492f961cbe4228cf819b98ac837cb0b3e1a2dcf4a9d
254 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript that utilizes the `exportDataObject` and `nLaunch` functions to automatically save and execute the EICAR test file upon opening. The document body explicitly instructs the user to click to launch the embedded file, which is identified by ClamAV as a dropper. The primary technique observed is the use of JavaScript to launch an embedded artifact, likely intended to test antivirus detection or as a lure for more complex attacks.

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-7266047-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7266047-0
  • 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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