PDF malware analysis — malicious · 48a7f99a276672b4

MALICIOUS

PDF

8.1 KB Created: 2010-07-31 00:02:48 +04:00 Authoring application: vc_k2K (via 9e1a510b)

MD5: f9cd95642aef4e4064e9717c9df5c001 SHA-1: 47ec81341501ac883e3f60a1aa2268503ef40d2c SHA-256: 48a7f99a276672b424747b5acb5c7bf4a9d88580e067e5ac4c3ea11d3183c469

104 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of eval() and String.fromCharCode suggests obfuscated code execution. The ML classifier strongly flags this PDF as malicious. The primary function of the embedded JavaScript appears to be the execution of obfuscated code, likely to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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. (matched inside decoded stream)
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
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `584a379a51e5e5732fbf24289dd3af29748f22be340f7e927515cd2631e05cee`	pdf-javascript-stream	PDF /JS object 11 at offset 0x1912	509 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `bcba5e4f4026cf2279324908a65bb249ef15e48842db1a8f6f43f01a549eab64`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1A7A	193 bytes
`javascript_obj0015_002.js` `dd5008766ec011fddcadbc207cc7b9edb6eb9878d7930ccdf4a40a05dc28e01e`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1B7B	45 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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