PDF malware analysis — malicious · cddd1ce741f56ce7

MALICIOUS

PDF

4.6 KB Created: 2008-31-20 53:85:00 Authoring application: 971 (via 971 1.5)

MD5: deef18a7a3642299283592515c5bc714 SHA-1: d7d972c0963a67161ed0b4c740cc2a2d43d5048c SHA-256: cddd1ce741f56ce7f93ef0c8fc2a1d28f7372428b820885bd0a6f5532347ca0a

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded 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 embedded JavaScript stream, named 'javascript_obj0013_001.js', is heavily obfuscated, making its exact function difficult to determine. However, the presence of eval() and unescape() calls within the JavaScript strongly suggests it is designed to deobfuscate and execute malicious code, likely downloading and running a second-stage payload.

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` `e9163856f120713f82a2d59446b8870bf4e06157731c40e293697ba24a2f30f1`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D4	73018 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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