PDF malware analysis — malicious · dce331dafd93cdff

MALICIOUS

PDF

7.0 KB

MD5: 2a86cd44c1ce9f97ac9ff6adafc69c4c SHA-1: 588f73ad9e9e03afb85af935ccd3dac4ca9b2cca SHA-256: dce331dafd93cdff3852db143f9a511e406a1228430c3fba215aa8d8b350cfb0

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The ML classifier strongly suggests maliciousness. The presence of 'unescape()' and obfuscated script indicators points to an attempt to hide malicious code, likely for downloading and executing a second-stage payload. The document body is unreadable, but the script's presence and obfuscation are sufficient indicators of 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_obj0009_000.js` `d5142be1b836d4c7406b528ba42d2946557f83bf5d02643524213dbfb20ec496`	pdf-javascript-stream	PDF /JS object 9 at offset 0xD6	5791 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).

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