Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5eaca2afc0c25c…

MALICIOUS

PDF

2.1 KB
MD5: 6b09fb2abcebc9eb8b0a4f77fbd6e779 SHA-1: ac478ab4860214935edc9940b2385803ed09e207 SHA-256: 5b5eaca2afc0c25c77c6d33d0bba2471f71927e6ca18dfe8255cb1a098db8963
254 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript that utilizes the `exportDataObject` and `nLaunch` functions to automatically save and execute an embedded file named 'EICAR.txt'. The document body explicitly instructs the user to click to launch the file, which is the EICAR anti-virus test file. This indicates a dropper or downloader pattern designed to execute a secondary payload, disguised as a user interaction prompt.

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-7263595-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7263595-0
  • 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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