PDF malware analysis — malicious · 52afe5178471f91d

MALICIOUS

PDF

11.2 KB

MD5: da4e5d2b96c514d5ba52d1b593d4be26 SHA-1: 0a47c013cde0db837ff8baf8bef466d8510cd6d1 SHA-256: 52afe5178471f91d408565712e0f6733aad94b2033e6755c5665d8f2cd7c1bd6

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contained embedded JavaScript. The JavaScript stream is obfuscated, and a heuristic identified an unescape() call, indicating an attempt to hide malicious code. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the ML classifier's high confidence and the presence of obfuscated script content.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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_obj0007_000.js` `f6d5965a811509c40cb137cec361ac18185125ae1d8992cd852388d153ec2a6e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	48626 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 273 eval/decoder/string-building token(s).

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