PDF malware analysis — malicious · da88219852a67a1d

MALICIOUS

PDF

118.4 KB

MD5: ab35536261a3500a7afe0f1e5d0175be SHA-1: 3a13c3dd7f2e8ab2d989fd574e7c58428df4d7a7 SHA-256: da88219852a67a1dedc0fcfa0ec5184c43693976a0569eeeaf82646975876f58

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' heuristic specifically points to a stager designed to execute JavaScript. ClamAV detection as 'Pdf.Exploit.Agent-36086' confirms its malicious nature. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, although the exact mechanism is obfuscated.

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` `d307e99dbacdbfc20a4aea7e46e643ea9c1f9cd35f13f937682f9cee71753348`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626410 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_off0001d60a.bin` `2c6aa899da5f774efb2a1722b1410d0e2a186d34e74ce6159b31abb676056a04`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D60A	300 bytes

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