PDF malware analysis — malicious · a882ebe339dbf672

MALICIOUS

PDF

118.6 KB

MD5: 9de67bbed8cae5f83a23b11147d00063 SHA-1: a443c13ce10a91e2ac53b22435b897f39ebc04db SHA-256: a882ebe339dbf672c35dfa5c10d9b8ed1ceb40c7a67d7c190100f8cfe40767b8

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, including a large comment-padded eval stager, indicating an attempt to obfuscate malicious code execution. The presence of eval() and String.fromCharCode() further supports this. ClamAV detection as 'Pdf.Exploit.Agent-36086' confirms its malicious nature. The obfuscated nature of the script prevents a more detailed analysis of its specific payload or persistence mechanisms.

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` `62b002b0665322aadf322bc55c753d7731b9a3c77e618cb55963865e581fa8ce`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626264 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_off0001d8c2.bin` `ee064a90e2446f03ceccbe3e627973db09dbb756d3b698b0860bf7213703edd3`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D8C2	200 bytes

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