PDF malware analysis — malicious · ed4b600479180a24

MALICIOUS

PDF

4.1 KB

MD5: fdf55b96ff857ba362f2bf83b02a7160 SHA-1: 7e1b1cc5297323f64ba2a0c4287eb8ec9338da71 SHA-256: ed4b600479180a24b3603495047844f272f6e4cdc7b84ab43e8402ba7309bce1

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flagged this PDF as malicious. The JavaScript streams, particularly 'acroform_b64_00.js', appear to be obfuscated and contain eval() calls, suggesting they are designed to execute arbitrary code. The primary intent seems to be downloading and executing a second-stage payload, though the exact mechanism is obscured by the obfuscation.

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` `a785c201d99077b9d08759f84c80ae3526578b7fa099bdfffd5e80223c02331f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6361 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` `ddc73471d777cb823c96b6941158c4ee30c8293a5c2371e600740345e89eda89`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3616 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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