PDF malware analysis — malicious · 4b4d03158a8c1e1e

MALICIOUS

PDF

2.7 KB

MD5: 1ec005cef3dae531c4b0e585813fab05 SHA-1: 2cf67c98026e8c45a077fdac8fc737edd524248a SHA-256: 4b4d03158a8c1e1ef238fda6c2e28d496c3dc2b1f4cbb02d4a5e682ba58857c4

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an eval() call and String.fromCharCode within the decoded JavaScript stream suggests that the script is obfuscated and likely intended to execute arbitrary code. The heuristic 'Suspicious extracted artifact' with the signal 'Script obfuscation indicators' further supports this. The primary attack pattern is therefore the execution of malicious JavaScript embedded within a PDF document.

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_obj111711_000.js` `2823640b8309982013249ea3a1c57ffb49222a7da0224e0c9ac3c2c03decbdb1`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	2594 bytes
`javascript_obj111712_001.js` `fca79c44762114097b39466d19fe4eefae0f9db928a230fe4a56c6df4c134b91`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x8E2	531 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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