PDF malware analysis — malicious · 508bed93e79b268c

MALICIOUS

PDF

15.7 KB

MD5: 0172dcf8b91a19a03f31b54e1eaba3a7 SHA-1: d1c00b3adb882d4e8ba50be2b0c8f19f00b8f5d9 SHA-256: 508bed93e79b268c766b7793a9472ac1f5e1d29ef6f0150fa48fbbaf38831233

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains embedded JavaScript, which is heavily obfuscated and utilizes eval() calls and String.fromCharCode, indicating malicious intent. The ClamAV heuristic 'Pdf.Exploit.Agent-36086' and the 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' heuristic strongly suggest this is an exploit stager. The extracted JavaScript files, 'javascript_obj0006_000.js' and 'legacy_pdfkit_stage_000.js', are 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` `413949eb779e0e86295a666c6dbdb8fb0fb5029e0931898c1aff97fc0d1a6ca1`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424992 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` `a6fb14b9738273d2b1d032d018d1c94981d0d5132e38b68132277649b3d44205`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 534 long base64-like blob(s).

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