PDF malware analysis — malicious · d92242b862d516c3

MALICIOUS

PDF

118.5 KB

MD5: 686ca0515c4bee275e32367c5fd1506a SHA-1: 0de3dcaa7ef5de0746f2b3dde0ab43e41d063fca SHA-256: d92242b862d516c376ce7a2ca0f161845056037e210d5ec714b4d7d74bb891ff

204 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, with high-confidence heuristics indicating the use of eval() and a large comment-padded eval stager. These techniques suggest the script is designed to download and execute a second-stage payload. ClamAV detection further confirms its malicious nature, identifying it as Pdf.Exploit.Agent-36086.

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.
Suspicious extracted artifact high 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.
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)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `ffeb643b31aabf6907f185f48fe94fe85f8e596a85ea9e0e4ee51ee3ee1c8ba1`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626237 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 32 shell/COM execution token(s). Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `56a35f0a615e3145b6725cdfb8ef91d550c817bf154f9e850cab74e617fb4809`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 14 shell/COM execution token(s). Carved artifact contains 597 long base64-like blob(s).

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