PDF malware analysis — malicious · 24b73d5fa1939580

MALICIOUS

PDF

118.4 KB

MD5: 3bd0ab63b28ca146689f1789346ebed9 SHA-1: 430acf28cce5a5616b7dea543e3090425c423f1d SHA-256: 24b73d5fa193958049bf08bb986e690a04fac0b4b3b3338731f84cccc63a6417

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a heavily obfuscated 'eval stager' that is designed to download and execute a secondary payload. The presence of `eval()` and `String.fromCharCode` within the JavaScript streams, combined with the ClamAV detection of 'Pdf.Exploit.Agent-36086', strongly indicates a malicious exploit delivery mechanism. The document body was unreadable, but the script behavior is clear.

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `5f17514c36c581b93377a5f7d9c0f926d65d3f205af06d7f7e7ac54290b8114d`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626095 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_001_off0001d5fc.bin` `4f73eea0a50603434be657000a1ba2993fab0c7c31ccfa17514142b10c7c1fe7`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D5FC	300 bytes
`legacy_pdfkit_stage_000.js` `5a89e35eca9bd2d9887e36974466a6b4f8fd591fcd885d69d45a7510817c2d26`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 559 long base64-like blob(s).

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