PDF malware analysis — malicious · 3da9cc7034ad30be

MALICIOUS

PDF

118.5 KB

MD5: 52dcf117bdad4d02ff72255ec358ae80 SHA-1: fe193fbaa378a377aeec21d0e2fdec93e2de1ea7 SHA-256: 3da9cc7034ad30be97eb5bf977122c7e0ca94ed9d0f773842c6f9e163434fad2

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The critical ClamAV detection 'Pdf.Exploit.Agent-36086' strongly indicates a malicious PDF. High-severity heuristics like 'PDF_EVAL' and 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' confirm the presence of obfuscated JavaScript designed to execute arbitrary code. The embedded JavaScript streams, particularly the deobfuscated 'legacy_pdfkit_stage_000.js', are characteristic of stagers that download and execute further malicious content. The file's purpose is to leverage these JavaScript capabilities for initial compromise.

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` `cfc397514d7e016fc9755450bbe264176d0a44a4feb05028393ced56beec6671`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627154 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` `71d82497d2a592ac9215b29b81a1ed643d4bc47660eae2462d6ee383554eb105`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 592 long base64-like blob(s).

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