PDF malware analysis — malicious · fa6872b31af7457a

MALICIOUS

PDF

13.9 KB

MD5: c34352b8fd648ef5ab5a716ba17bbc6b SHA-1: 808a9daacb399c5ceb20d15bc4c41695d3554d8e SHA-256: fa6872b31af7457a767850d53414d2635eb414e2052056f0ea7a383576f6db61

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript stream, named 'javascript_obj3332_000.js', is likely responsible for executing the malicious payload. The presence of unescape() and decode filters suggests obfuscation techniques are used to hide the script's true functionality, which is typical for PDF-based exploits.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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.
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj3332_000.js` `6d2c5951088e55177160db39ffbef53ed408932dd18c020d523d599702d4adbb`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x35DE	341 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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