Pdf.Dropper.Agent — PDF malware analysis

Static analysis result for SHA-256 8b77dc685908e6b7…

MALICIOUS

PDF

2.0 KB Authoring application: Python PDF Library 055 http072057057pybrary056net057pyPdf057
MD5: 091b3b3d96da9d6282ce75997164a863 SHA-1: 923b8bdeb454bfd773e3729575bd641e57c04bd3 SHA-256: 8b77dc685908e6b76cc92e1729dc386ad29613ed435a89e62d3fd0975c5d080d
148 Risk Score

Malware Insights

Pdf.Dropper.Agent · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by ClamAV as Pdf.Dropper.Agent-7005223-0 and a machine learning classifier with high confidence. It contains embedded JavaScript, which is obfuscated and uses unescape() calls. This script is likely responsible for downloading and executing a second-stage payload, as indicated by the 'Suspicious extracted artifact' heuristic. No document body text was available for analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-7005223-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7005223-0
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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.
  • Suspicious extracted artifact info 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0009_000.js
8562af1af6f2b4cb6b61bf17148dd7dcc4ff3d3babff6ae847e0f3b7fcf4df60
pdf-javascript-stream PDF /JS object 9 at offset 0x2EE 1817 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s).