PDF malware analysis — malicious · 88677f515b670c8d

MALICIOUS

PDF

15.7 KB

MD5: 8157475fa103d72bf2807ea20d78a05c SHA-1: 97df051eeb92ad6be15675ffa886070565acfd87 SHA-256: 88677f515b670c8d5bb00d48400cdbc2353c53831870ece0aa7ed56cac8a29c1

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including a large comment-padded eval stager, which is indicative of an exploit attempt. The ClamAV detection 'Pdf.Exploit.Agent-36086' strongly suggests this is a known exploit. The JavaScript likely attempts to download and execute a second-stage payload, although the specific details are obfuscated. The presence of `eval()` and `String.fromCharCode` further supports the malicious JavaScript execution.

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` `de8456a4b57205e93cf0168290276a171d45720b0837aa992c8abc50913a277f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425648 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` `3a363f82c935d73e620c441f3dfe0a9d3d87d8d12b436471f311a767d13349f8`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262090 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 584 long base64-like blob(s).

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