PDF malware analysis — malicious · d43ae8ea60c76b5e

MALICIOUS

PDF

133.6 KB Authoring application: PyPDF2

MD5: c8753912219f6f2acfd4639b078f195c SHA-1: ef9d7fb0260b691ae3fbe9a5a04357b4d14d2cbf SHA-256: d43ae8ea60c76b5e85cd26928abf6e99da6322b466de2c81c68f8ed925c863d6

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly flags this PDF as malicious. The presence of two large JavaScript streams suggests complex obfuscation or a significant payload. The primary intent appears to be the execution of this JavaScript, likely to download and execute a second-stage payload, as evidenced by the ML_NYX_PDF_MALICIOUS heuristic and the general nature of such embedded scripts.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
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_obj0004_000.js` `a383a103142dd5191babe5b8521e2e7939fcec7066d9b5e5a1ad9c643542c82d`	pdf-javascript-stream	PDF /JS object 4 at offset 0x134	99403 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0004_001.js` `133331d3a8bd90d4073c07d0837130c1df9cf3febf1da6dfb28c23583a445843`	pdf-javascript-stream	PDF /JS object 4 at offset 0x134	98044 bytes

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