PDF malware analysis — malicious · 24e770880c474520

MALICIOUS

PDF

14.9 KB

MD5: f073ea741d5454795484a22d053453e0 SHA-1: a1dd1bd162fb4672a870fcaf6b99a04a2b45a2ca SHA-256: 24e770880c47452063cf31a05487e01feaa9ffe58e64a7cf77c092ed9ee3c9b4

154 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_UNESCAPE, along with ML_NYX_PDF_MALICIOUS, strongly suggests malicious intent. The deobfuscated JavaScript files likely contain code designed to download and execute a secondary payload, a common technique for malware delivery. The obfuscation methods used, such as hex escape sequences and long encoded blobs, are typical of malware attempting to evade detection.

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` `93f3fdceb942579280d3f196f445d15453064a5ad968d92ae645d590c8b83fa8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x195	166 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` `89968ed24c947e31765e5ae166a467d9ac38955a408c70c7bc24f01fe3945768`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x298	19744 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` `0b2f53abf27921961886fe48ad9c898c92195a4e13c27d280b8bba50e67f93c0`	deobfuscated-js	PDF JavaScript deobfuscation pass	75738 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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