PDF malware analysis — malicious · 1f7408289dac902e

MALICIOUS

PDF

118.6 KB

MD5: 2a6b817ccee7db52c3c4ab32a547a42b SHA-1: b5df5e46e9131ead5d0fc5c5ae530cdbb8ecda97 SHA-256: 1f7408289dac902e1ae1cc06d31b5d8db38825d4b321a822053fdbf6e734669e

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, including a large comment-padded eval stager. This JavaScript is heavily obfuscated and uses String.fromCharCode, indicating an attempt to hide malicious code. The primary function appears to be downloading and executing a second-stage payload, as suggested by the 'eval() call' and 'PDF_JAVASCRIPT' heuristics. The ClamAV detection 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. No specific family could be identified due to the obfuscation.

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` `afb55763d16f03143ec7b61e32d114df11b4219d644a04117b9649dea7d85c41`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627092 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` `fedaa55560a731ae1ef0d1c83c1cad246692fbc5c4ae03bb55ebb2acc49dfbb3`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 638 long base64-like blob(s).

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