PDF malware analysis — malicious · b6275f7c5a84f761

MALICIOUS

PDF

50.0 KB Authoring application: yZecpxOG6uR0sPHbXQimvwB2nzjMWaALgKto8f1Ih4T7DYUNC3VS9l5FdqErk%J

MD5: 4a7285dbc2eb4028e1d11914231766e9 SHA-1: 2c43fbd950a5fa3501585bc9ef80d0a7dec45af2 SHA-256: b6275f7c5a84f761dd3120ae0f1e2a17b40c07ac815af40357558542a869302a

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The ML classifier and ClamAV detection strongly indicate maliciousness, identifying it as Pdf.Dropper.Agent-7216689-0. The JavaScript, which uses unescape() and appears to be obfuscated, is likely responsible for downloading and executing a second-stage payload, a common dropper behavior.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Dropper.Agent-7216689-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7216689-0
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_obj0018_000.js` `10832384addebe12ebea7ec3e76383c661ee4e23be2ebea36c147a19fdfc4bd0`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	25050 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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