PDF malware analysis — malicious · d2ffa8ee78b788da

MALICIOUS

PDF

23.0 KB Created: 2011-72-51 03:25:00

MD5: f860c04413d64aefd1652c5c9e57f2cf SHA-1: fbc05257ea283e273e39abb81a5e797b9ff656c8 SHA-256: d2ffa8ee78b788daf7c8241cb65fa98be956a08c7ed86e0e5856ad601296aeb4

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly suggests maliciousness. The embedded JavaScript, named 'javascript_obj0001_000.js', is likely responsible for executing malicious code, potentially downloading a second-stage payload. The exact functionality of the script is obscured, leading to a slightly reduced confidence.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
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.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `f163b8edf7e842727250e83c2ddc12c1176deed09f1075cef50a4e1442d4d2a5`	pdf-javascript-stream	PDF /JS object 1 at offset 0x585E	737 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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