PDF malware analysis — malicious · e4c04f29a7c296d4

MALICIOUS

PDF

22.4 KB

MD5: f98e20ea0e42f9bb543f685c711897b2 SHA-1: 25b91204e95fd3e862dd73dceac70c475439d036 SHA-256: e4c04f29a7c296d4031aa70ea5968db8a16b7313c76646350009d995af81afee

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript, which is heavily obfuscated using eval() and unescape() functions. The ML classifier strongly indicates maliciousness. The JavaScript is likely designed to exploit a PDF viewer vulnerability and download a second-stage payload, as suggested by the presence of obfuscated script and the ML_NYX_PDF_MALICIOUS heuristic.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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_obj3332_000.js` `e6614c6c268ebf6c00969675a0789fa767b85f13cc344a5c5782c7739004cd30`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x57CD	182 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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