PDF malware analysis — malicious · 45a4a2e57755ac3f

MALICIOUS

PDF

12.0 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: a74d4a86a077cd687f2b2fe77d46a2b3 SHA-1: 61e591a8d1640de6ff469f92f837bbbc288b5745 SHA-256: 45a4a2e57755ac3f3ad4ef03fdd0d638073731d45192a371eeb0ed602d675802

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes `String.fromCharCode` and an `eval()` call, suggesting obfuscation to hide its true functionality. The ML classifier strongly flags this as malicious. The primary function of the embedded script appears to be the execution of further malicious code, likely a downloader, based on the common use of `eval()` in obfuscated JavaScript payloads.

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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `6756c438ebbbdf2c4fce88f6931988160fbc66525e4454136c0e0928bfc099a0`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	1031 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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