PDF malware analysis — malicious · af8150187c322cb9

MALICIOUS

PDF

143.9 KB Authoring application: PyPDF2

MD5: cf9c131126912b9762842f563ec50ad5 SHA-1: aabf6172b8e76dcfab35a9ed0f9c549e30ce1855 SHA-256: af8150187c322cb9c575e071e345e3ac0fa59e44e0e6da8ae43eaaf51acb7ff1

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF contains embedded JavaScript streams, with one stream being deobfuscated and flagged for suspicious content and obfuscation indicators. The presence of `eval()` calls within the JavaScript strongly suggests that it is designed to download and execute a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

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

PDF has 2 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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `f3a5d7627c1a9c229390bcfbf3f42859d7edfbd351cc24ba7a19efa999559fbe`	pdf-javascript-stream	PDF /JS object 5 at offset 0x212	95217 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0005_001.js` `f4f4b81c40bfeeac9e13816b666175230c91ec294c00a749f971b883ddcb3f16`	pdf-javascript-stream	PDF /JS object 5 at offset 0x212	93849 bytes
`new_array_token_stage_000.js` `7a03d7edbad069e75d5673680bd98f18328aaa0939459be747d0594905b5b4bc`	deobfuscated-js	new-array token-map decoded JavaScript object 5 at offset 0x21A	16957 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 shell/COM execution token(s).

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