PDF malware analysis — malicious · 6d451a99b45f90f8

MALICIOUS

PDF

25.2 KB Created: 2009-08-24 12:39:39 Authoring application: ijehrbedjm (via zxxotjxvbyk)

MD5: ba9bf24c12b1198f90efdccb68e4e5fa SHA-1: ac521ac48df37ba3af2e497019ced14eef13d746 SHA-256: 6d451a99b45f90f8c898b193296a2fc2ecbc8b85d63f94db476726c83ee55256

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF containing obfuscated JavaScript, indicated by multiple PDF JavaScript heuristics and an ML classifier. The script uses eval() and String.fromCharCode() to deobfuscate and execute code. The primary function appears to reconstruct a string, likely a URL or command, which is then evaluated. This suggests the PDF is designed to exploit a client-side vulnerability to download and execute a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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_obj0012_000.js` `d7d1c9005c1b626e9705800edb3bbd5d8ef6427fc076c1f27730cd814407f508`	pdf-javascript-stream	PDF /JS object 12 at offset 0x34C	24294 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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