PDF malware analysis — malicious · fc42dc45de58da9b

MALICIOUS

PDF

118.6 KB

MD5: 220016bfc5c2773ebce12a72cc3321c9 SHA-1: 55803796f66ca5f2d76b33d58416bff3b11c7422 SHA-256: fc42dc45de58da9b0dacec5b2432078cf2a0bd62d539eb8362c1d0f2d32e5234

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including a large comment-padded eval stager. Heuristics indicate the presence of eval() calls and String.fromCharCode, suggesting code obfuscation and execution. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly indicates an exploit attempt. The embedded JavaScript is likely responsible for downloading and executing 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` `b4a0722b95bc4d175ce05705a967e0da8cf1e8ca40be2c4d3e55f393caf6d768`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627055 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` `24bbb600cb97cdcd4ad22a3e41d67601fbfaee14ad120c18156370d4531d2b54`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 646 long base64-like blob(s).

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