PDF malware analysis — malicious · 83b25f5e6814c3a0

MALICIOUS

PDF

118.6 KB

MD5: 985d64d9d07d140d39c493db94018018 SHA-1: 1e94044c2e05a723597f80f170895143112c49e4 SHA-256: 83b25f5e6814c3a09e59d4c6d1824d957a36fb5b1c4e10a186da78b0352bcb1f

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, which is heavily obfuscated and utilizes eval() and String.fromCharCode. A heuristic specifically flags this as a 'Large comment-padded JavaScript eval stager'. ClamAV also identifies it as 'Pdf.Exploit.Agent-36086'. The obfuscated JavaScript is likely responsible for downloading and executing a second-stage payload, although the exact mechanism is obscured.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `02880dcaf673fe8c2a1ef5db0f4b52b43cb5e89e6ea525c26ec182f0c210db2e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627567 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).

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