PDF malware analysis — malicious · ea335066276ce836

MALICIOUS

PDF

118.6 KB

MD5: d4e455a055e0029da50002c865eee851 SHA-1: c264671f1c57f68cee1c992a59601579e94a24b8 SHA-256: ea335066276ce8365a569dc0e84cdc8e291f1832c85110fe123ca892a81c26b4

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. A high-severity heuristic 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' suggests a stager designed to execute code. ClamAV detection as 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The primary function appears to be the execution of obfuscated JavaScript, likely 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `50056f7bd097c91d37a8eecf50128bd8d9b9032d04636f058f15ece123480739`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626962 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_off0001d6e5.bin` `4d865097b4b1a834a1b841c530797f43d10d8145629d1265e7449ac7e6bc149d`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D6E5	300 bytes
`stream_002_off0001d898.bin` `27403ed2e1ca2c521470f348035831f0b05f2a59ba0d426fad0ab100e0b652bf`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D898	200 bytes

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