PDF malware analysis — malicious · 3c53ee99ef5d326a

MALICIOUS

PDF

641 B

MD5: 3f5da360c58519f046d75bd4a184bf1e SHA-1: b6af6daffa591e05e3dbe90a6f39790b79f8d4c9 SHA-256: 3c53ee99ef5d326aa455605aaa4a623f4ff3ac1ebc1678fe6022cce92f0dd23a

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, PDF_UNESCAPE, and PDF_FROMCHARCODE. The JavaScript stream, named 'javascript_obj111611_000.js', is obfuscated and likely responsible for downloading and executing a secondary payload. The presence of eval() and unescape() calls strongly suggests malicious code execution within the PDF.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `9e2cbe1165d119e9fa1134c4148742a30cf51304fc5b773f61dfe78f21c39544`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x1B9	80 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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