PDF malware analysis — malicious · 86ecf598fc93cf67

MALICIOUS

PDF

15.7 KB

MD5: c6331c8baf616912ddcfff7d44d4d68e SHA-1: b986ec85a290b3372e087b50b61aae36d313c07e SHA-256: 86ecf598fc93cf6731ba5b73bdd8c849ce1a240e0518f72bcdd38bb27431a7b3

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including a large, comment-padded eval stager. This indicates an attempt to obfuscate and execute malicious code. The presence of `eval()` and `String.fromCharCode` functions, along with the ClamAV detection signature 'Pdf.Exploit.Agent-36086', strongly suggests the exploitation of a PDF vulnerability to download and execute a secondary payload. No specific family could be identified, but the technique is common 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` `ee2e08434aafc6ed19f2a02584bbc7b34c683dd82dcd89a4148ae41082069a90`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425689 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` `cb0b6bf9a6a0b1ccb76193d766af7abec2fc704373d35c1f9f1ce2964ae9e4eb`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 429 long base64-like blob(s).

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