PDF malware analysis — malicious · d485a3b056df64b9

MALICIOUS

PDF

118.7 KB

MD5: 58c760fa5b4f7fa57adc7e07a3b35e2f SHA-1: d8046bcf689ac36f80fd8bfa7189318972f691a6 SHA-256: d485a3b056df64b9cf90a183a69117610761ea517ece07263ed4d420733780ba

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious Link

The PDF contains embedded JavaScript, including a large comment-padded eval stager, indicating an attempt to obfuscate and execute malicious code. The presence of `eval()` and `String.fromCharCode` further supports this. ClamAV detection as 'Pdf.Exploit.Agent-36086' confirms its malicious nature, likely involving exploit techniques to deliver a secondary 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `896925d07dd6f29491dc8e4643337ff824dc8fbdbafaca5608a8dc50c36f243a`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627280 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_off0001d8e1.bin` `2868efb0315fe620d6af0389380c570d861eb15e460872f36558f23897cd5056`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D8E1	200 bytes
`legacy_pdfkit_stage_000.js` `965487afc07d847472f12909525452106988e2faff11a6035b8ec54ceddfe3b0`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262136 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 585 long base64-like blob(s).

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