PDF malware analysis — malicious · 27808c043c91e9ad

MALICIOUS

PDF

10.9 KB

MD5: a77dc1f9d5e8368b3725be86f762c1c8 SHA-1: 26683f7a0c09b2de101436899cc32512c184a43a SHA-256: 27808c043c91e9adc99b6d3abc0bfd52ecfa52f0299f698b8131de9d686e3f66

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file was flagged as malicious by an ML classifier and contained embedded JavaScript. The JavaScript stream was obfuscated and utilized an unescape function, 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 heuristic firings and the presence of an extracted JavaScript file.

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` `21fc84228066e21bf094d4fb07f5a4bd159241bd313c28d91eab0514819f71ce`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	47506 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 267 eval/decoder/string-building token(s).

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