PDF malware analysis — malicious · c0f0faea1367434c

MALICIOUS

PDF

291.8 KB

MD5: e95835a114365c06b5a5e7e4382c15c9 SHA-1: 1b1cf677a6b417a889ea83854ee90522a826ecd7 SHA-256: c0f0faea1367434c224dff2647bc349667541d4fbc101bb0dd62151e6bd3ad54

78 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream, identified as 'javascript_obj0008_000.js', exhibits obfuscation indicators and utilizes String.fromCharCode, suggesting it's designed to evade detection. This JavaScript is likely responsible for executing a secondary payload or establishing a malicious connection.

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` `055d43d89d7f853094669bd6037d482e7985999d9f1535dbd722736f75054278`	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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