PDF malware analysis — malicious · 1bc49e0a5cc22201

MALICIOUS

PDF

118.6 KB

MD5: c11b52bf81d50e34c8571e5af44dcac9 SHA-1: d474bf726bbd84be1e68a552995bbfc0787c3bb8 SHA-256: 1bc49e0a5cc222013f10eaa11892992095d313e79364ef1e7b9be120c6608842

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains multiple JavaScript streams, including one with a high-severity heuristic indicating a large comment-padded eval stager. This suggests the script is intentionally obfuscated to hide malicious actions. The presence of `eval()` and `String.fromCharCode` further supports this. The ClamAV detection of 'Pdf.Exploit.Agent-36086' strongly indicates an exploit attempt. The primary intent appears to be the execution of a malicious script, likely 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `84d2ae5c0b35452f1c457208a7cc702697fe70f18aa493ea34c22a1a315ddad7`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627439 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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