PDF malware analysis — malicious · c966e1730d0828cd

MALICIOUS

PDF

8.1 KB

MD5: 9fa1fad8d8fd8f1241c08c2f994565ee SHA-1: 14c08f6dfbc99c81e90f4fceaea31c43b1e8f3d6 SHA-256: c966e1730d0828cd1f9f51f42166ede5383537105963d868a8d78b8f8a05f0fa

154 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1027 Obfuscated Files or Information

The PDF contains embedded JavaScript that utilizes `eval()` and `unescape()` functions, indicating obfuscation and dynamic code execution. The ML classifier strongly flags this PDF as malicious. The extracted JavaScript files suggest the primary intent is to download and execute a second-stage payload, likely leveraging obfuscation techniques to evade detection. The specific payload or download URL could not be definitively reconstructed from the provided evidence.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `b28a3ca1b28bafdd5ba590efba1d8e94645dacd02d9ba3979ac960fd22adceb1`	pdf-javascript-stream	PDF /JS object 7 at offset 0x195	111 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `d128072fa43a4ba1b652e6299e4396af7439a5da1ad6c3b208c97ef48c16d766`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x273	16084 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `81e39b69e34dec039a45269d23c91f3e9df49471b390c3f7cfe2d60b4629b12a`	deobfuscated-js	PDF JavaScript deobfuscation pass	55286 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).

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