PDF malware analysis — malicious · d52ff471e44e6641

MALICIOUS

PDF

15.7 KB

MD5: 56292aad2f06519972b1623ac35efba4 SHA-1: 32f9fd49d273851c1e73ee148ef915162c7e80a9 SHA-256: d52ff471e44e6641f1595a4d4ed4b9932a5d1a72c489b74c6150386c1255933c

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript, including a heavily obfuscated 'eval' stager. This stager is designed to decode and execute further malicious code, a common technique for downloading and running second-stage payloads. The ClamAV detection 'Pdf.Exploit.Agent-36086' further supports the malicious nature of the file.

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` `eab40c71420c9d3fb772140c987cac48857c5813536e1f206fcc1ed64882e0eb`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424780 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_off00003d29.bin` `ec8425bf2b3f304d19166b121b1c946608e42f189b606c05bc3ebeef23bb7775`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3D29	200 bytes
`legacy_pdfkit_stage_000.js` `2bce80fea771d3d7b6a9d441c32f37a40f676a9d5bdde3eed35855d8e2498aeb`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 720 long base64-like blob(s).

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