PDF malware analysis — malicious · efd80eefefa4a335

MALICIOUS

PDF

4.0 KB

MD5: e111ed76324ca143166caa4ba42dc26e SHA-1: 8bf011f874020fbd9f3e160681cccec0082bd62d SHA-256: efd80eefefa4a33513873c1c96df3f9a8a003fc0eab344036fb7a98f3d6884d3

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The ML classifier strongly flagged this sample as malicious. The presence of 'eval()' and 'String.fromCharCode' suggests obfuscated JavaScript code is being executed. While the exact payload is not directly visible, the structure and heuristics point towards a downloader attempting to execute a secondary stage. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj0013_001.js` `3de98397728d52e56b52ab8a0554d2357c95f5e41a118a9203c9844609b94b0b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6325 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `f01cbefd594462e7ccab215c201aaa3e151af22e22b3adf30fdda2292d2ded9b`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3589 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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