PDF malware analysis — malicious · 8290e2e8c8cfa740

MALICIOUS

PDF

4.6 KB Created: 2008-31-20 53:85:00 Authoring application: 3665 (via 3665 2.5)

MD5: 16246fdc253ed615e5bccaa78ee6d513 SHA-1: 3c1254d57e1fffe3838e8267ff05f64175934d90 SHA-256: 8290e2e8c8cfa740ea136bf8b56067a56a3e4d7249433f25b44038473c98b7c8

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged as malicious by an ML classifier with high confidence. Static analysis revealed embedded JavaScript containing obfuscated code, including calls to `eval()` and `unescape()`. The presence of these functions strongly suggests the script is designed to download and execute a secondary payload. The extracted artifact `javascript_obj0013_001.js` is the likely source of this malicious script.

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)
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_obj0013_001.js` `a6dd92e4e6531e510f60e55b6aa113304faecaa55bf836220f44b62a3ea1a066`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D4	72970 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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