Malicious PDF — malware analysis report

Static analysis result for SHA-256 5358545471737bf8…

MALICIOUS

PDF

6.9 KB
MD5: 9f1ca003dca52bff6527d3facca5e54c SHA-1: 7d415e183b08963bea1929c7ed279c7222940e81 SHA-256: 5358545471737bf8726da33f16b34ffb1345b435fdbb6789314d66834f5dab5f
90 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. A high-confidence ML classifier (ML_NYX_PDF_MALICIOUS) also flagged the file. The JavaScript stream, named javascript_obj0009_000.js, contains obfuscated code with eval() calls, suggesting it's designed to download and execute a second-stage payload. The PDF differential parser failed, but this does not impact the findings from other heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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
0df5652a2e48f74e9573265ca2798d3776360d621ecff825194977801babe3ad		 pdf-javascript-stream PDF /JS object 9 at offset 0x33C 27339 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.