PDF malware analysis — malicious · 983b4533708e2e04

MALICIOUS

PDF

8.1 KB

MD5: 00da3c10379f82b2f3f041d31fee039a SHA-1: 5dd38cbb5b3ae6a68b2c765596b330bf7ce37c9e SHA-256: 983b4533708e2e0403435fd410be3afbf800ce5e8535aa7fe0c05a55ec00060a

154 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple high-severity heuristic firings indicating embedded and obfuscated JavaScript. The ML classifier also flagged this PDF with a very high probability of being malicious. The embedded JavaScript, particularly the use of `eval()` and `unescape()`, strongly suggests it is designed to download and execute a second-stage payload, likely a downloader or dropper.

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` `679ed18a8e72efd40832dbded9be21962482ae6018c2168f87859e1b51ecc2ad`	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` `b09a0393bdc3414f6aaa36c6b4488313c88c489fcce972774c1fbebde1b7c096`	deobfuscated-js	PDF JavaScript deobfuscation pass	55241 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).

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