PDF malware analysis — malicious · aff706d860d3f392

MALICIOUS

PDF

118.5 KB

MD5: c4457d970b9ae08a6722b5fb0b5ff45c SHA-1: 5ea635e798879793e74dac6e2d5fe4233fcb8799 SHA-256: aff706d860d3f392eee72bab39d65810b9c28dc425d643153b07c791d1aefc28

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including 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 exploits a vulnerability within the PDF reader. The presence of eval() and String.fromCharCode() further supports the execution of arbitrary code. The document body was unreadable, but the heuristics and ClamAV detection point to a clear exploit attempt.

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` `01b8d3cde72d98f4d1186419ee6138f870d66be0507f5be08f23aab9d91c6a69`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626863 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_off0001d840.bin` `62dcfc659444f904951925b24d33fcfbf694e5484aeceb7b12f74292da729129`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D840	200 bytes

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