PDF malware analysis — malicious · c427f3245b27d5c4

MALICIOUS

PDF

4.0 KB

MD5: e131bfc594a435e17ab292a2dfeab062 SHA-1: de655fb375b8345247a64674991adbbc2c04c297 SHA-256: c427f3245b27d5c430f5d4508af0e649805c423f33c0578b07aa5c949545f557

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_FROMCHARCODE firings suggest obfuscated JavaScript code is being executed. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript likely downloads and executes a second-stage payload, consistent with a dropper.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7300452-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7300452-0
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` `b65cbed835da2266baf30d98a608ca6a05424420dac82fc8292d5911c59bf732`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6381 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` `c34f514b3d404e9dad22e81b490934527dbc026b8821000bdb661e8fae1c3ad9`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3632 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).

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