PDF malware analysis — malicious · 28f4801cbbe5b6d6

MALICIOUS

PDF

118.7 KB

MD5: 4799437dd61237d04fdf4ddd41ae3089 SHA-1: feaa45ac4fb52e606874540481ef54d9248fe4e2 SHA-256: 28f4801cbbe5b6d6c0528277ef0d814980e921ab507187590ea423b7db74905f

166 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file exhibits high-confidence indicators of malicious JavaScript execution, including `eval()` calls and a large comment-padded JavaScript stager. ClamAV detection as 'Pdf.Exploit.Agent-36086' further supports its malicious nature. The embedded JavaScript streams, particularly 'legacy_pdfkit_stage_000.js', are indicative of a downloader or exploit stager, likely intended to fetch and execute additional malicious content. The lack of readable document body text prevents a more specific determination of the lure, but the technical indicators point to a common exploit delivery mechanism.

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` `63c77368ed4451c0d25375f0358b63551afecee45b0c86b5e07b56d1504c74f7`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	628382 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_001_off0001d761.bin` `2ec1d4b28fa5ab42072f143c1b8f388d372e751381c895bac86ac18754c5e8b0`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D761	300 bytes
`legacy_pdfkit_stage_000.js` `05b844a03c23282d90ebd871e6bf914f689244cae21b1992f3e1f81b545e5ab8`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 626 long base64-like blob(s).

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