PDF malware analysis — malicious · 431609e87a7fff32

MALICIOUS

PDF

118.5 KB

MD5: 38adf1e99be6c857d88f051fbe0e65eb SHA-1: 154c7606e205e1490c1954630842330e59b41c68 SHA-256: 431609e87a7fff32fb9e8558fc42648a9d767e857b97afc401bb6aea8ff868d5

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, including a large comment-padded eval stager. This suggests the script is designed to deobfuscate and execute malicious code. The presence of `eval()` and `String.fromCharCode` further indicates code execution. ClamAV identified this as 'Pdf.Exploit.Agent-36086', strongly suggesting it's an exploit attempting to download and run a second-stage payload.

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` `c6ca365ff2388e0ca879e1f8005ef0bc7fed0b15e08582520b8a74d495eed866`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626343 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_off0001d685.bin` `ed119bfa1df64c406b92b6d72177a86ab388e9acaa7b24e19d1646d395749471`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D685	300 bytes

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