PDF malware analysis — malicious · 8848b02a5f41b39b

MALICIOUS

PDF

291.8 KB

MD5: 11b2cd555cfe9ed270cce4f96e10b172 SHA-1: 2c29e1c482d5b2fecf21d287a621f03f5d5fd361 SHA-256: 8848b02a5f41b39beffbc71da27f39b83e6a917695d9ac6c5c3891dae246e0fd

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript, named 'javascript_obj0008_000.js', is likely responsible for executing malicious code or downloading a second-stage payload, though its specific actions are not detailed in the provided evidence.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `568fabbbafa66379d889ad6d474786a1b9b0ffeac3dee596f7fb622328c20577`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1CE	99336 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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