PDF malware analysis — malicious · 0882c206a7ea0a60

MALICIOUS

PDF

52.7 KB Created: 2009-11-07 00:15:42 +03:00 Authoring application: comesOneWeb (via 6d80fca29ede446759da7bf81c4a1b1e)

MD5: fc525fd3ed4be0a5f2edba37f283c627 SHA-1: 8047a7f3632ddbf864fa28d2945c5bc6421ab888 SHA-256: 0882c206a7ea0a6021eb36480172c4a3d329402185ed0a361192df45b29a0e20

154 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, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_JS_EXPLOIT_CLUSTER. The JavaScript code, particularly the large stream in javascript_obj0029_000.js, is heavily obfuscated but contains calls to `eval()` and string manipulation that strongly suggest it is designed to download and execute a second-stage payload. The ML classifier also indicates a high probability of maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

Heuristics 5

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 (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.
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0029_000.js` `69f8ba44cf3d9db0d94e23bd949ec296919d92f811f644c52ec963ba124e2fda`	pdf-javascript-stream	PDF /JS object 29 at offset 0x3E6D	4096 bytes
`javascript_obj0030_001.js` `c48a01dcede7f0c024f3edd036d51b1fc27ec0a3d1cce3d3066f3994d1075c2a`	pdf-javascript-stream	PDF /JS object 30 at offset 0xCBAE	40 bytes

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