PDF malware analysis — malicious · 7a5a243bd9a4f07a

MALICIOUS

PDF

118.5 KB

MD5: efdd2acbbea8992823d89957982ac5e5 SHA-1: 7f016185cd0331365afe8755cd7fb8ea30f2d537 SHA-256: 7a5a243bd9a4f07a78deb1e7550b13f274f6a9e6a61a1a948df0d3403d4ff895

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains obfuscated JavaScript, including a large comment-padded eval stager and multiple eval() calls. This JavaScript is highly suspicious and likely responsible for downloading and executing a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body was unreadable, so the rationale is based on the script behavior and heuristic firings.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj0006_000.js` `fead14d0d1534ea8e3afbbd75d2505c76a69b40bd505d86c0a65c16e26efda47`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627109 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).
`stream_002_off0001d821.bin` `ce1830c1eced61e9674fd902dd8c5ab8d1c955822895b6c67ccd3121c0ba0d96`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D821	200 bytes

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