PDF malware analysis — malicious · 51a2a38cceea6ed8

MALICIOUS

PDF

118.5 KB

MD5: 9b8195002aa574d0d6d0ec4faf27bdbd SHA-1: d4de74007f55261cee7c705ac80fa8d430078e0e SHA-256: 51a2a38cceea6ed8ff648ef1d07193e8cadb3c00b25a6371ad457a6c2a30834b

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including a large, comment-padded eval stager. This stager is highly obfuscated and likely responsible for downloading and executing a second-stage payload. The ClamAV detection 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. Due to the heavy obfuscation, the exact payload and delivery mechanism cannot be definitively determined.

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` `4b73529f9342f286326e130d6b80e07d9c17097b330c153fb72d0fb19dbe3461`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627508 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_off0001d857.bin` `e9ecaafcbf9a0ad54b4dba0e9165a2e4182751f475ea92ae4b6f69f2379938c5`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D857	200 bytes
`legacy_pdfkit_stage_000.js` `cf3b39696fef0bb889e36f5d1ca446ad0c3c1468e5b1b2f05d4dfb59782075ab`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 608 long base64-like blob(s).

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