Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a96ec03ba8242c…

MALICIOUS

PDF

10.1 KB
MD5: a1ddc9ebe19a3d43ec25889085ad3ed8 SHA-1: 0fa681a24df1b6ee6960bf1098af9689cfb8a576 SHA-256: 86a96ec03ba8242c1486456d67ee17f919128754846dbb3bdf5e836059091dba
276 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that utilizes the exportDataObject and nLaunch functions to automatically launch an embedded file named 'eicar-dropper.doc'. This embedded file is detected as a VBA EICAR dropper, indicating a malicious intent to execute further payloads. The ML classifier and ClamAV detections strongly support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 8

  • 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-6299400-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-6299400-0
  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
  • 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://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
eicar-dropper.doc
eb0ae2d1cd318dc1adb970352e84361f9b194ff14f45b0186e4ed6696900394a		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x3E0 31744 bytes
Detection
ClamAV: Doc.Dropper.Agent-1540415
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
javascript_obj0009_000.js
a5be9c6113e4547c52c62b50fbcf707b392d0560f3f2c1b6e486be27b1dd0020		 pdf-javascript-stream PDF /JS object 9 at offset 0x26EF 66 bytes
javascript_obj0009_001.js
009d97c59a3a7a22f7c36e7823c3119416d2c20b70ad3559b2c4678dffe73039		 pdf-javascript-stream PDF /JS object 9 at offset 0x26EF 64 bytes
combined_document_js_000.js
5d8953bc4649c23802d326b41f68676eb412c9d671c73f753d394c915d96e2f5		 deobfuscated-js combined document JavaScript streams at offset 0x26EF 131 bytes

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