PDF malware analysis — malicious · c34430e27b813541

MALICIOUS

PDF

118.6 KB

MD5: 7066269944260230834ec41ff779fb52 SHA-1: fd62eff6660281c467609d95ed4ac4fca6066dd4 SHA-256: c34430e27b813541ab77dea5bf3ccc3bd2805ddf2529f5b4880b0b0e9166a0ce

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a PDF containing obfuscated JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristic firings. The presence of PDF_EVAL and PDF_JS_LARGE_COMMENT_PADDED_EVAL suggests the JavaScript is designed to execute arbitrary code. ClamAV detection as 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The embedded JavaScript likely acts as a stager to download and execute a secondary payload, a common technique for initial access.

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` `575993a9653a974285b67cbbf42e4019cb44d7042fa98a26cf399878916f7e5f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626687 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` `f3a9023c67730c1305ea33463eaa286f632b87b1df1884b97a324186286ca916`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262118 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 579 long base64-like blob(s).

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