PDF malware analysis — malicious · de90e9fa6334a8c6

MALICIOUS

PDF

118.7 KB

MD5: d5a4594d847a6d8a5fecbf4ddd969685 SHA-1: 507d73acb637e56666e44aa3f7f31d0c97cd7e6c SHA-256: de90e9fa6334a8c6a97ec7d71cc77d4fe661b30408be581cb4e5d2c16994b320

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was detected by ClamAV as Pdf.Exploit.Agent-36086. Static analysis revealed embedded JavaScript streams, including one with a large comment-padded eval stager. The JavaScript likely contains obfuscated code designed to download and execute a second-stage payload. The presence of `eval()` and `String.fromCharCode` calls within the JavaScript strongly suggests an exploit attempt.

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` `ffe97ad700d81e251b6790e3e9013fa41f66eaec6daa7134d70e7bc2330ff648`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626806 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` `8b6b9e4ab3ad04e4c4c88eac8d1c12b43fa1140526afbeb922e0a37c240acf5c`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262116 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 512 long base64-like blob(s).

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