PDF malware analysis — malicious · 5ac2588408a06f14

MALICIOUS

PDF

2.8 KB

MD5: e12a5fbbed6e82e56b35d2fca5ed994d SHA-1: 8dc945e77393ab20966fab34002273cde77b5be1 SHA-256: 5ac2588408a06f146b3005af9af277809976988eaba9094f9493e759b003324e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript streams that utilize eval() and String.fromCharCode() functions, indicating an attempt to obfuscate malicious code. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, a common technique for initial execution and further compromise.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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_obj111611_000.js` `0d7703e013cc092f6e17f32766323c39f8c8c98ae1a09b82a4e761ed02fc23d8`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	256 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `0cd58467fee1b7622584e1bdadf52ab19fe1ee2a0f00f28b43dd3b965fef50e4`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x266	3363 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.