PDF malware analysis — malicious · be491235b1f1869f

MALICIOUS

PDF

11.8 KB Created: 2009-02-19 14:45:49 -02:00 Authoring application: Writer (via OpenOffice.org 3.0)

MD5: b3f9c818776079666cda83a0b95289a6 SHA-1: 97f56ae883a6e6df5d0123b91280bd9bbb35939c SHA-256: be491235b1f1869fda6b2e8d47e7aed028cbf7c5b92ce074c7a18f792d867dc4

228 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is a PDF containing embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, PDF_LAUNCH, and PDF_EVAL. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript, identified as 'javascript_obj0027_000.js', is likely responsible for executing a secondary payload, as suggested by the 'eval()' and 'unescape()' calls. The 'PDF_LAUNCH' heuristic further supports the execution of external code.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

ClamAV: Pdf.Exploit.Agent-35541 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35541
Launch action high PDF_LAUNCH

PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
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.
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_obj0027_000.js` `aaee4602f37c8f7b91d0e7f87005d80b8c216bef933fd34521b70d4015268795`	pdf-javascript-stream	PDF /JS object 27 at offset 0x21C1	62370 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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