PDF malware analysis — malicious · a8e8b68802dfda51

MALICIOUS

PDF

2.8 KB

MD5: def9fee1b4fedb34108daec7d0009863 SHA-1: 32340bdf2340d17d17ac212b7a7709f5dcbec75c SHA-256: a8e8b68802dfda510340107d4c7465277b310e699c173f647c4fb87b44d52aff

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF document contains embedded JavaScript, with heuristics indicating the use of eval() and String.fromCharCode(). These techniques are often used to obfuscate and execute malicious code. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript streams, javascript_obj111611_000.js and javascript_obj111612_001.js, are likely responsible for the malicious behavior, potentially downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `5e0673098ea0731dd05e46311ac9f6ba85d2efd5252de1c709d07e47d69e418a`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `5f0f364af8fdf4245ebebe2a86110619f78eaa2e35d1217e4f167a2e6a824d5b`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	3367 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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