PDF malware analysis — malicious · 898ec0ef0ef7d7ca

MALICIOUS

PDF

4.0 KB

MD5: 5b620f9ac8ce2d19ffd1668f2cb561df SHA-1: 44393c1623b3b1c02ad0b8334923878c98841a74 SHA-256: 898ec0ef0ef7d7cae6d5d94b685c82606da5268d874f81ca1c0cf62c7447f0e0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier and ClamAV detection strongly suggest maliciousness. The JavaScript, particularly the eval() call and String.fromCharCode usage, is heavily obfuscated but likely responsible for downloading and executing a second-stage payload. The ML classifier output of 0.999991 and the ClamAV detection of 'Pdf.Dropper.Agent-7280102-0' confirm its malicious nature as a dropper.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7280102-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7280102-0
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` `a617c7347a01dae2d33adc7fec70b013a59b5c7adc4dd627f7198290684f52ad`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6261 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` `f22b90871c257fc55744d5d9a656e0e62097b4f6682e59e30bc068d6ec447a3e`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3542 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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