PDF malware analysis — malicious · 4bb8554ba929cc9e

MALICIOUS

PDF

118.7 KB

MD5: c8f520ba83b24b2c78a44c0ff40250b8 SHA-1: 9835394fad8a45aca8d78380001d2c4bd43e3ef0 SHA-256: 4bb8554ba929cc9e4d189b0e8ccb2403e367383c7ae6745e508bd0f4b2b97c87

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_JS_LARGE_COMMENT_PADDED_EVAL firings suggests the JavaScript is obfuscated and designed to execute arbitrary code. ClamAV detection as 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The primary attack vector appears to be exploiting a PDF vulnerability to run this script, likely for downloading and executing a secondary payload.

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` `60b45a15100dbd47cdc7ae522a308f54dc28a529d5622d53c2c156f1a211db8e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627359 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` `0b055905b6488db998eba47ab38f92137d9eb4521c3e46845c03adb2bb462798`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262136 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 563 long base64-like blob(s).

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