PDF malware analysis — malicious · abeb59b95dba75a2

MALICIOUS

PDF

118.4 KB

MD5: ff9d8b3ed0c83b86564d6e8ceac26e90 SHA-1: cb5dfd9cab25103bdc905896b0d53e5f8a73ff11 SHA-256: abeb59b95dba75a2cc4e43eee30cb9c4a726438cd1b7087bab6c11ac76ea7268

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a high-severity 'eval()' call and a 'Large comment-padded JavaScript eval stager'. ClamAV also detected it as 'Pdf.Exploit.Agent-36086'. These indicators strongly suggest the PDF is designed to exploit vulnerabilities and execute malicious code. The ML classifier output further supports this assessment.

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` `aa8cedd13cbdc41fb76b583c633da885d7319a315a7a1d023bf410ab7ec2a851`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626203 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_off0001d7fd.bin` `db0fb1c3dff68c54c810e0deda7b8742692baaf6818c6c2c583d363c4a4bb9b8`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D7FD	200 bytes

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