PDF malware analysis — malicious · 42cf57becdfe1285

MALICIOUS

PDF

1.5 KB

MD5: f8ecc08cf7f4723e99097c4d9a1b6015 SHA-1: be4ea0e8796e2b61ae078da51d89a7fd6c41e0b4 SHA-256: 42cf57becdfe12850388b57b4615ff2156197ccf5627976cec941454de4dac89

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by an ML classifier with a high confidence score. It contains embedded JavaScript, which is further indicated by heuristic firings for PDF_JAVASCRIPT and PDF_JS. The JavaScript stream was decoded using unescape(), suggesting obfuscation. The primary function of the embedded script appears to be downloading and executing a second-stage payload, as indicated by the 'javascript_obj111111_000.js' artifact. The ML classifier's high score and the presence of obfuscated JavaScript strongly suggest malicious intent.

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_obj111111_000.js` `393599f01d3aeee0dff1516b57841d39132020b65c725bb6f8779f18f07dece8`	pdf-javascript-stream	PDF /JS object 111111 at offset 0x160	2223 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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