PDF malware analysis — malicious · a30c1ce582549056

MALICIOUS

PDF

4.0 KB

MD5: eacb3d7a299f1dc3350112ee0a2ef39e SHA-1: 03c7035aa119d933dacfb2f813f5249294791272 SHA-256: a30c1ce58254905643fe07dfc6e3228efda711ab69c94a0cea2413dfec4648cc

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly indicates maliciousness. The deobfuscated JavaScript (`acroform_b64_00.js`) likely attempts to download and execute a second-stage payload, as suggested by the `eval()` call and `String.fromCharCode` usage. The exact payload and execution method are obscured, leading to a slightly reduced confidence.

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_obj0013_001.js` `fe0ef426bca331e6c51c1892fd7aacf746b8a88b3c06c37e971aba9b5734ed9b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6353 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `4fed2698946426f4571b9b03d8b63c0bf4e949e50266e26289fc7e816189b508`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3612 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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