PDF malware analysis — malicious · a13ed9fce937be05

MALICIOUS

PDF

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

MD5: 21aeae4c4c0a605e67e45f274a9e37f6 SHA-1: be15c6a6a3e3e398ffe3918fc7f16e4410eae147 SHA-256: a13ed9fce937be05e4f49063545264c2a17a3bd0a018627d76c5400057d8744e

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF contains embedded JavaScript, which is heavily obfuscated and utilizes an eval() call. This suggests the script is designed to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness. Due to the obfuscation, the exact nature of the payload and its ultimate destination cannot be determined with certainty.

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` `83492581a8eba2501fc277ad0cfb2a3a8283aecee0927762a14af60cd42b604e`	pdf-javascript-stream	PDF /JS object 1 at offset 0x648B	888 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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