PDF malware analysis — malicious · 623595b5bc58b2c4

MALICIOUS

PDF

15.1 KB Created: 2009-06-16 16:03:30 Authoring application: gSiFSarYchWZJOPXlnqXvJ (via vZdQiOSTJFzNEfBk)

MD5: e4f24bb18abbef374e23332c53bee8a5 SHA-1: f2f1ed2f461507a92debf797af0b77f2c35df9fc SHA-256: 623595b5bc58b2c405feda4a57d36d5754cf326d5194d75d8f4b59f85f7706c9

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains embedded JavaScript that is heavily obfuscated and utilizes `eval()` and `String.fromCharCode()`, indicating an attempt to conceal malicious code. The presence of PDF JavaScript exploit cluster heuristics and ClamAV detection strongly suggests this is a malicious PDF designed to exploit vulnerabilities and execute arbitrary code. The primary function of the JavaScript appears to be downloading and executing a second-stage payload, as is common with exploit-based PDFs.

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.
ClamAV: Pdf.Exploit.Agent-35572 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35572
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `f5e6374b13dfea79f19fdf95281a78c6a173db804b04f936f4caf76f33f370e5`	pdf-javascript-stream	PDF /JS object 7 at offset 0x501	13261 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `232f2fc742b3922d7e2dd55134720bd334e62a443cf8e60b656fec40e0af4f58`	pdf-javascript-stream	PDF /JS object 7 at offset 0x501	1899 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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