PDF malware analysis — malicious · 96f3597e16ad5e4c

MALICIOUS

PDF

2.8 KB

MD5: a43fbaf2c81737cd4ee7dca478b3ed2a SHA-1: 8837edc9bf1daa5d6e7cb79a33e3b584b23f7429 SHA-256: 96f3597e16ad5e4c11ab5bcd96e7212778664c31ffadaa0d4b25b2c024e61663

66 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The eval() call and String.fromCharCode usage suggest obfuscated code designed to execute arbitrary commands. The extracted JavaScript files, 'javascript_obj111611_000.js' and 'javascript_obj111612_001.js', are likely responsible for downloading and executing a second-stage 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` `163ccda25355508e972203834c7dffd6be9c293cd0bbf84191f762485bf84be3`	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` `f7fedd5c6cba2fb0e829d7bf2f99a64b288575a9e578e8fec203de42c0dd4741`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x268	3355 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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