PDF malware analysis — malicious · c55f3a66a7b49c01

MALICIOUS

PDF

118.6 KB

MD5: b2cad3d71b8755b755137d782bf88a36 SHA-1: 2aa2ad4f8c15f4d9c349c50cc3469ccdb5786cac SHA-256: c55f3a66a7b49c01babe8dd682ba155e67a60356d192cefc0f5f1463f03aecb7

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a call to eval() and a large comment-padded eval stager, indicating an attempt to obfuscate malicious code execution. ClamAV detected this file as 'Pdf.Exploit.Agent-36086', strongly suggesting it's an exploit. The presence of JavaScript and eval calls points to an attack pattern focused on exploiting PDF vulnerabilities to run arbitrary code, likely to download and execute 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` `015dd8953f50baab050c390ef5d57e32ffeaae08456dff02b1a0bc04ed25b87e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627159 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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