PDF malware analysis — malicious · a58dbf4c8d90bf05

MALICIOUS

PDF

53.2 KB Created: 2009-04-25 22:47:18 Authoring application: kgzPyIQRtkbPzUtBOzW (via AatRqgTCwJrHRCzXX)

MD5: 2ef805172dca59dea8dae16c25207489 SHA-1: 112f18361fbe308b4c477ead658a095bf537577a SHA-256: a58dbf4c8d90bf05bdd24ac1dc6da4de212fd1755e767769d5c710169b29bebc

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by an ML classifier and exhibits several high-severity heuristic firings related to JavaScript execution and obfuscation, including the use of eval(). The embedded JavaScript stream, named 'javascript_obj0007_000.js', is likely responsible for downloading and executing a secondary payload. The document body contains nonsensical text, indicating it is not intended for human consumption but rather as a lure.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
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_obj0007_000.js` `8704511597523939317e00c40ee0a4a6956499259fc49991094699f26a76e738`	pdf-javascript-stream	PDF /JS object 7 at offset 0x49F	52617 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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