PDF malware analysis — malicious · d4fdb77245249df0

MALICIOUS

PDF

1.5 KB

MD5: c144fdf35b6c5515c68a1679a894aea4 SHA-1: eeca8ae4884cca516ce8124ed08a5f0c0322c204 SHA-256: d4fdb77245249df0eb43e393c41212b844ae445950792c1545521e57a14aa207

88 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flags this PDF as malicious. The presence of unescape() suggests obfuscation of the JavaScript payload. The primary intent appears to be the execution of this embedded script, likely to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111111_000.js` `c427982804b69cac861e9cbdb6cc98136810829de300211c88b12b036f0bcacf`	pdf-javascript-stream	PDF /JS object 111111 at offset 0x160	2215 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`javascript_obj111112_001.js` `0739bdf44b53e9ba1b73960c2bc0dcd98be54adba7a36276bd38e0f91279adc4`	pdf-javascript-stream	PDF /JS object 111112 at offset 0x53B	66 bytes

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