PDF malware analysis — malicious · aa41f94ddda0b061

MALICIOUS

PDF

118.5 KB

MD5: 555a2114be88d9cff81f00a1b815fe92 SHA-1: b32741cb8d00a0bbe09ee9eaa9fbbe99c5eccc12 SHA-256: aa41f94ddda0b061d1aef8dfd12a25ed4c15c8d9444898b0d8fc2daedd5a0290

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical ClamAV detection of 'Pdf.Exploit.Agent-36086' and multiple high-severity heuristics (PDF_EVAL, PDF_JS_LARGE_COMMENT_PADDED_EVAL) indicate that this PDF is designed to exploit vulnerabilities. The presence of embedded JavaScript, specifically a large comment-padded eval stager, strongly suggests it attempts to download and execute a second-stage payload. The truncated document body prevents a more specific analysis of the lure.

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` `2918a4de5623db7fa1f6fd2355cdc61b708f3e9d364d11c779f8705c78ce246c`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626494 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_002_off0001d85f.bin` `b8f031aa7cfb863a01ec32c297014d2ebaf53303cf465a4409a9fee976941ddf`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D85F	200 bytes

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