PDF malware analysis — malicious · cff655663d4a7fe1

MALICIOUS

PDF

15.7 KB

MD5: bf8d4d4f0d51ff3c30b57d06a81c2f1d SHA-1: 4990fd14190ff6782e33791d310de2544eb87597 SHA-256: cff655663d4a7fe1ef5c50bb6e5f77d77f4724329ee22ea4e0960e4cbaa3af30

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1566.002 Spearphishing Attachment

The PDF contains embedded JavaScript, including a large, obfuscated eval stager. Heuristics indicate the use of eval() and String.fromCharCode, common techniques for code obfuscation and execution within PDFs. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly suggests an exploit or malicious payload is present. The primary function appears to be the execution of this embedded JavaScript, likely to download and execute a second-stage 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` `db0f9cfa65efb2c3134cd9278a36f1524c52579909a58d8c751c421c885501dc`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424377 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` `06f23dcd2889bd60ecee4bb9186e55244b104b11ab6ed9e3420dda647848a8ed`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 617 long base64-like blob(s).

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