PDF malware analysis — malicious · e2e8e7b03b8e21fd

MALICIOUS

PDF

13.0 KB

MD5: b3605abe7cb691d5a9c90564ce3c4270 SHA-1: 999506383f3a3f9e432509c85e41d701731ff6c3 SHA-256: e2e8e7b03b8e21fd89384fee09ca94bd101f6e0f56c4df1892280d5f9d9628e2

154 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

The PDF contains embedded JavaScript that utilizes eval() and unescape() functions, indicating obfuscation and execution of malicious code. The ML classifier strongly flags this PDF as malicious. The primary attack vector appears to be exploiting a PDF vulnerability to download and execute a secondary payload, likely via the deobfuscated JavaScript found within the embedded artifacts.

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` `069ca91eabd49f457d408e88079cb45512697c3f931c779995598c0a54c4d98d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x298	17515 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` `57e519083e586c171002f48b0a2dcae285aa0840356f3bcf745c22927a940aa4`	deobfuscated-js	PDF JavaScript deobfuscation pass	100120 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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