PDF malware analysis — malicious · 2e4b2d3e623425a5

MALICIOUS

PDF

118.7 KB

MD5: d6754e9c222b2ca55aea78c7178b0ff9 SHA-1: cf953bc09bbe1b2e8a821b2cdea0e9a4db63bf02 SHA-256: 2e4b2d3e623425a54e4129f4dd1e0fed913c9d0ac14fd5c259ab4401c7dad228

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, which is heavily obfuscated and uses eval() calls, indicating an attempt to hide malicious code execution. The presence of 'Large comment-padded JavaScript eval stager' and 'PDF_JAVASCRIPT' heuristics, along with ClamAV detection as 'Pdf.Exploit.Agent-36086', strongly suggests this PDF is designed to exploit vulnerabilities or deliver malware. The obfuscated JavaScript likely downloads and executes 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` `ff6e94a3d50dbc3b04692daf0554ce68ce24ee10fa8c07d7cdcd4734704dc1b9`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627416 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_002_off0001d8d9.bin` `401d999a91abe1aecd109c98eb80b3edbe5a8e701dab5686d95f2a07302f759b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D8D9	200 bytes

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