PDF malware analysis — malicious · 7cb687b76cbad944

MALICIOUS

PDF

15.7 KB

MD5: 1ea468697f38b7d1fa4b37ec4b545853 SHA-1: 9219a3098c033320bca88946169f66d9d1d9a371 SHA-256: 7cb687b76cbad944c97629ff8747d51bdd70b1bf06ae859f85b5035a8a35b8d6

166 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, which is a common technique for exploiting PDF vulnerabilities. The presence of `eval()` and `String.fromCharCode` strongly suggests the execution of malicious code. ClamAV detected this file as 'Pdf.Exploit.Agent-36086', indicating a known exploit. The primary intent appears to be the execution of a second-stage payload, though the specific download URL or payload is not directly discernible from the provided evidence.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `8189e7dd23b1b8ee24f4bfa6d39d1a8dec230fcc20463b4e959299e0da3837b0`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425443 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).

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