PDF malware analysis — malicious · a51408ed8f1297a7

MALICIOUS

PDF

118.4 KB

MD5: b24b2beb659882940fcc3f4fa44270dd SHA-1: 843681abef9371b4b35fbde962047a4675cd1946 SHA-256: a51408ed8f1297a79144088a7cdde799b989077c27125316389f4c68e8894cb3

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, including a large, comment-padded eval stager. Heuristics indicate the use of eval() and String.fromCharCode, suggesting obfuscated code execution. The ClamAV detection 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The primary function appears to be the execution of this JavaScript, which is likely designed to download and execute 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `df0fa81a2625cd584290309116fcd9b0d2ca0afe4d76aca5ff6647849e78c3a9`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626896 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_off0001d605.bin` `9f2ca2954949b4ab9c6041ffd5435ce2bbcd0a54f3d28755b02f03589d4c6ce6`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D605	300 bytes
`legacy_pdfkit_stage_000.js` `107978e10fa7cfd7c6b273618275ad19202d2f84fc44e27eef3ed61fc082f113`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262118 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 546 long base64-like blob(s).

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