PDF malware analysis — malicious · 4da313506200a662

MALICIOUS

PDF

15.7 KB

MD5: 0e6811df95063b1c57eafee840a1d61b SHA-1: 9d8b56a1aca0493a7b26bade7849a6cddadc8c4c SHA-256: 4da313506200a6629d4a11f57153466e338da14a8576b68081351afb87fb7d9a

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains heavily obfuscated JavaScript, including multiple eval() calls and String.fromCharCode usage, indicating an attempt to hide malicious code. Heuristics like 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' and 'CLAMAV_DETECTION' with the signature 'Pdf.Exploit.Agent-36086' strongly suggest this is a malicious document. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload, as indicated by the large size of the extracted JS streams and the obfuscation techniques used.

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` `61867ae948f3028cecabba033cbe290c6bb9aaa5966477d2147c017e95b8010b`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425107 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` `66e92360525b32d10adab87f53bfa741933b926ab2a1258d1f599bfb5de9d234`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262090 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 745 long base64-like blob(s).

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