PDF malware analysis — malicious · 2b7e2adf5f0dbb9f

MALICIOUS

PDF

118.6 KB

MD5: 26e027f03e739eb1e6c3cf335f9b6f80 SHA-1: 80f8a279acc1ad7f5c05723c8858b1bbbcb950c6 SHA-256: 2b7e2adf5f0dbb9fc00933dc682f604a21eff49d0808f4f4df362a82f18eaeb1

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains multiple JavaScript streams, including one with a large comment-padded eval stager, indicating a deliberate attempt to obfuscate malicious code execution. ClamAV detected this file as 'Pdf.Exploit.Agent-36086', strongly suggesting it's a known exploit. The presence of eval() and String.fromCharCode() further supports the interpretation that the embedded JavaScript is designed to decode and execute a secondary payload, likely a downloader or dropper.

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` `50619b9c64a6db3fd4ee092dc90855aa7d9cb763ccaca56803092c141e79d4ce`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626988 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_off0001d6cd.bin` `637719620d672084b791ead396f4e092c35d21132fb6e3669ff2747329593377`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D6CD	300 bytes
`legacy_pdfkit_stage_000.js` `d7fdbd23ebbec046092e89883cba0fe77cb0cd91b4cfb5d59fad514461e947cd`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 644 long base64-like blob(s).

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