PDF malware analysis — malicious · 2c9289d464c62e2e

MALICIOUS

PDF

118.6 KB

MD5: 487bb9e4d3638270da96d1c4556e07f7 SHA-1: 48ab1d589e9d1074ae63b55db2d8ef8875b07f86 SHA-256: 2c9289d464c62e2e4ca4b9c61b667e9d55b86ed5bd520286c3d2a0f112137c69

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including a high-severity heuristic for a large comment-padded JavaScript eval stager. This indicates the script is designed to obfuscate its execution and likely download and execute a secondary payload. The ClamAV detection of 'Pdf.Exploit.Agent-36086' further supports the malicious nature of the file.

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` `c81f7cc068abca16a10c4b40b3bd7fdb7e4de76c308b7bc2924efcd45dca7704`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627151 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` `9deeafdf772f0f02f29cb35e7671a62b2c8a199b0e94388675b5f3e8ce925135`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262088 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 620 long base64-like blob(s).

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