PDF malware analysis — malicious · b5a17a0d78d1e89c

MALICIOUS

PDF

4.1 KB

MD5: a7b159befe2beec99cdd8176b69ec026 SHA-1: 6458a985a36156f7d020824e7c06359155cfb16f SHA-256: b5a17a0d78d1e89c64b3f1f5c647d3b27648a6898177be08f7c180d8bbc863b1

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly indicates maliciousness. The JavaScript stream utilizes eval() and String.fromCharCode, suggesting obfuscation to hide its true intent, which is likely to download and execute a second-stage payload. The presence of deobfuscated JavaScript files further supports this. The exact payload or delivery mechanism cannot be determined without further dynamic analysis.

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` `27cfa0272b1d34445902414f2ae83dd57ef7b52d8384e0d07bbaf45334bc7f4e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6413 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` `0066764971eee09869d8a599a1c0fb8ddafa1e879759596e7b870a3a93c4b2eb`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3657 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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