PDF malware analysis — malicious · 54f8b647c85c249e

MALICIOUS

PDF

18.2 KB Created: e1svrt Authoring application: Adsfgddfobe (via sfgasdfgsd)

MD5: e12f23928b5509ff851b968e5778283e SHA-1: 252ba38823dae4f833e19a2772215175a53f293d SHA-256: 54f8b647c85c249e7f3aa73924b018f7f132e05c657ef68c77a47d740091e5e0

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_UNESCAPE suggests the script is obfuscated and likely designed to download and execute a secondary payload. The ML classifier strongly flags this PDF as malicious. While the exact payload is not clear from the static analysis, the techniques used point to a common delivery mechanism for malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0015_000.js` `520c9cbd8a416fb3d3dcfca9a21f65677f3c845878c3562f5bdfd711219275ca`	pdf-javascript-stream	PDF /JS object 15 at offset 0x135	247 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0017_001.js` `80f8f7009ed3cfc0f825ebed32d9ac14cc13aaf64430528b4d198dcd81a3d6ab`	pdf-javascript-stream	PDF /JS object 17 at offset 0x45E7	266 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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