PDF malware analysis — malicious · 224530c4f0fafb2c

MALICIOUS

PDF

2.3 KB

MD5: fb6b3825cb62b597377a87e16e31a679 SHA-1: 3c54796807a9cc384bfaa86157f274be5c538f62 SHA-256: 224530c4f0fafb2c418d437443d7b5bc85d91bda590736a2f7be1a33ae52be42

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded and obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_UNESCAPE. The ML classifier strongly flagged this PDF as malicious. The deobfuscated JavaScript likely attempts to download and execute a second-stage payload, a common technique for initial access. The specific URLs or execution commands are not directly reconstructible due to the obfuscation, but the presence of eval() and unescape() calls are key indicators of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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)
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_obj111611_000.js` `e7d1232c16a6e584ebcad6ed89ed39659361935894de0b1df6aee2e4fe16ce04`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x7ED	478 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `c8d81e8e6b1e3f904188d9e31dba7dd442b47fa4500c0d57169e8b71c635e41f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2846 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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