PDF malware analysis — malicious · cba8fe2d273a9b70

MALICIOUS

PDF

15.7 KB

MD5: 71d26ded012b2b33d61108f94b092a09 SHA-1: fcc43d04211356bb52e0d40098f2e551094df663 SHA-256: cba8fe2d273a9b706fa22aafa73b10e07d6ee73b4ba7f41ce3da1bebb6da8dab

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a heavily obfuscated 'eval' stager. This stager is designed to decode and execute further malicious code, as indicated by the 'Large comment-padded JavaScript eval stager' heuristic. The ClamAV detection 'Pdf.Exploit.Agent-36086' strongly suggests this is a known exploit delivery mechanism. The primary function appears to be 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `5e3b38801badce0658c614817eabc115d3682c62c683c2bd9c5d0ddac2a1d5a8`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425133 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` `3f53562d1838cf3f151c2d492c88e3055f2a5a66ad6523889e06671f02ad492e`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 665 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.