PDF malware analysis — malicious · 96b7b5955c363e87

MALICIOUS

PDF

118.4 KB

MD5: 0ca2ccbc64d966ce2c5ceb4edbe077a1 SHA-1: 1bb44fa8d13145af474ae8952b59535ef6b81e93 SHA-256: 96b7b5955c363e87ac044fd995357985abde5d9464499d8fa137e2d37f15e52e

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscation and dynamic code execution. Heuristics like 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' and 'CLAMAV_DETECTION: Pdf.Exploit.Agent-36086' strongly suggest this is a malicious PDF designed to exploit vulnerabilities and download further malicious content. The extracted JavaScript streams, though large and obfuscated, are indicative of a stager mechanism.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
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_obj0006_000.js` `1f16fa2d6d0ce8b11402d699717abea10e237c105a17159d113c9c293b90e99d`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626924 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `ee0a81bd20a4d46e94a52095292a1b61c987b849ae4c6e6e096fb9c12cc8cbf5`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262118 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 570 long base64-like blob(s).

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