PDF malware analysis — malicious · 4ba7b581a9981292

MALICIOUS

PDF

118.6 KB

MD5: eaa6e6a1e41cda44958c0e7a8d637ae5 SHA-1: 8c0f9b6fb289acd3457cb61a9132e6a75c0fc207 SHA-256: 4ba7b581a99812924b610a4975d04a2523f9c27f4ae82043f11b14ea71b47e50

196 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF sample was flagged by multiple high-severity heuristics, including a large comment-padded JavaScript eval stager and ML classification, indicating malicious intent. The embedded JavaScript, identified as 'javascript_obj0006_000.js', likely functions as a downloader for a second-stage payload, as suggested by the 'eval()' and 'String.fromCharCode()' calls. ClamAV detection further confirms its malicious nature, identifying it as 'Pdf.Exploit.Agent-36086'. The lack of readable document body text prevents a more specific determination of the lure, but the technical indicators point to a typical exploit delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `85ab9fbeb1470878a26617ba34671bb913d910b01991955445ace6d78e55b863`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627028 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).

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