PDF malware analysis — malicious · fb655700ea37142b

MALICIOUS

PDF

4.0 KB

MD5: ec5e3b04b3e7a2abf36d7612f4c8f54d SHA-1: 9722688a3aa1e1ab7598dca09677869a4134e2a7 SHA-256: fb655700ea37142b09a593981f43f6d99cbe514cbed1d77056ac0ce4228608cf

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file was flagged as malicious by an ML classifier with high confidence. Static analysis revealed embedded JavaScript streams, including one that uses eval() and String.fromCharCode, indicating obfuscated code execution. The presence of these JavaScript artifacts suggests the PDF is designed to download and execute a secondary payload. No specific family could be identified, and no URLs were extracted.

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` `9458a3b660d618c5cac87a3be1cc2b77bb5baf47b6908ec08147f3b8db7946c3`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6321 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` `686c419c25f9320cd87617ba96d48e2623b1c94771614fcddf635d74d1e09fb0`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3586 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).

Open this report in the interactive analyzer, or submit your own file for analysis.