PDF malware analysis — malicious · d65ce4b473fdc231

MALICIOUS

PDF

118.8 KB

MD5: 92104236040dcd2ca3f1ed2f08fb88d0 SHA-1: 4cc77781fea968849b7a682fc2a304db7d6d6655 SHA-256: d65ce4b473fdc2310d6145c7fb98ac03f1671a1ea8ea0d3899c6fca518134c45

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple JavaScript streams, including one that uses `eval()` and another identified as a 'Large comment-padded JavaScript eval stager'. These heuristics, along with the 'CLAMAV_DETECTION' for 'Pdf.Exploit.Agent-36086', strongly indicate that the file is designed to exploit a vulnerability. The obfuscated JavaScript is likely responsible for downloading and executing a secondary payload, as suggested by the presence of extracted JavaScript files like 'javascript_obj0006_000.js' and 'legacy_pdfkit_stage_000.js'.

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `26057970687e137354c0df9e7dddc116b1e5b0058bd08960c1148d3e118e4130`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627312 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).
`stream_001_off0001d793.bin` `d29dc73974d913206baa365d9dedeb6186165b4083f0188fccbfb650d26a06ca`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D793	300 bytes
`legacy_pdfkit_stage_000.js` `dbdc4cbe4ee20e6a46761cb86c2a5e4a2168beaa13328004a4d27a2c93b30aaf`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 601 long base64-like blob(s).

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