PDF malware analysis — malicious · 52a96b8dc393bd46

MALICIOUS

PDF

14.7 KB

MD5: b0de37d96e629582499e93fa8b24fce0 SHA-1: 78bee7395cae48b080375d9ef198084021a9ee52 SHA-256: 52a96b8dc393bd46e600eba388f5f138799c81ab6b324b1e05336c56002cb733

154 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, which is heavily obfuscated using eval() and unescape() calls. Static analysis indicates this script is designed to download and execute a second-stage payload. The ML classifier strongly flags this PDF as malicious. Due to the heavy obfuscation, the exact nature of the payload and its ultimate destination cannot be definitively determined 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` `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` `ed19ed6160a0c8c202e20557b6154554b31ddcb744555c0b1c8d959d8fc5d24d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x298	19495 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` `9cc2e50c331af93f520a5947be2eee5152cb3be817cf10285568e4f0a704755c`	deobfuscated-js	PDF JavaScript deobfuscation pass	73579 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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