PDF malware analysis — malicious · 9516980478d66b7b

MALICIOUS

PDF

15.7 KB

MD5: 0e5b2e24e30c282b2b651135c93b110d SHA-1: 8ec80d3a209f4c3b4cfe60ece97bf64805de9af1 SHA-256: 9516980478d66b7b69bdc21c3e7499bfdaadf1049d1d3ca180949bd06f9a6ca2

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple JavaScript streams, including one with a large comment-padded eval stager. This indicates an attempt to obfuscate and execute malicious code. The ClamAV detection 'Pdf.Exploit.Agent-36086' strongly suggests exploitation of a known PDF vulnerability. The primary intent appears to be the execution of a second-stage payload, as evidenced by the complex JavaScript stager.

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` `9b1ffcd130c8a042644be3febccb777a8b1176e790e07bdf7578ce2079802d72`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424779 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_off00003b67.bin` `bd03389fa4e3600984761a380bea08e1b697d30b0257db89a8d05bb815192a83`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3B67	300 bytes
`legacy_pdfkit_stage_000.js` `dffb0ffa9245ef50d57a7ee3d110c401f94e9c7307d9a88b062aadbd4e6e890f`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 535 long base64-like blob(s).

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