PDF malware analysis — malicious · 58de7c35805f1db0

MALICIOUS

PDF

2.8 KB

MD5: 4299534cbc00dfba9698fc62130e1ac9 SHA-1: 43a4179d8eb47831d3607e1bcb5be47a786b0df2 SHA-256: 58de7c35805f1db0ec7811e796a1c07511a36c6def7f48aa3a4ec156bebe37ca

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 PDF_EVAL and PDF_FROMCHARCODE suggests that the JavaScript is obfuscated and likely uses eval() to execute arbitrary code. The extracted JavaScript files, 'javascript_obj111611_000.js' and 'javascript_obj111612_001.js', are suspicious artifacts. The obfuscated nature of the script implies it's designed to download and execute a secondary payload, a common technique for initial access.

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_obj111611_000.js` `4177910eeded3bef1b0c4caba0909070fc78d3c270fc0f028003d7038842f7fa`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `930f0db57b9d99642e8187b1955c8c8c44d5a8526209e60e2abb34de73d649ee`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x268	3375 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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