PDF malware analysis — malicious · 07a3fd39d033c78e

MALICIOUS

PDF

37.9 KB Created: 2009-08-26 02:03:11 Authoring application: QZbDSEYMVuNaOJh (via yRDUxZZkMxCArIwZrU)

MD5: 4afbc36385ed847a1a6f6a5618fb47c1 SHA-1: 81d5824c2519ff68141c1b4215aab8c8ae9503be SHA-256: 07a3fd39d033c78ef59d3d5b58aac279f47e97b4964dbaff0d58de4a8fbd2b47

216 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that utilizes `eval()` and `String.fromCharCode()` functions, indicative of exploit code. Heuristics and ML classification strongly suggest a malicious PDF exploit. The embedded JavaScript is heavily obfuscated, but its structure and the presence of exploit-related heuristics indicate it is designed to download and execute a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
ClamAV: Pdf.Exploit.Agent-30201 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-30201
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
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_obj0025_000.js` `ce50aa52651465333ff70f8929b59596c2213102e16dcc71976bb0e2d2c7fe1c`	pdf-javascript-stream	PDF /JS object 25 at offset 0x541B	16078 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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