PDF malware analysis — malicious · 1bfde1dcabd5bb71

MALICIOUS

PDF

118.7 KB

MD5: c2c1a9e75328df6c297f30dc01a1c72b SHA-1: df82c1b01fc7eb1c1f2fce449a8cdd75a265c066 SHA-256: 1bfde1dcabd5bb71d5bc901aed26915be67af9799616a8c25b0fec4c48d6fdcd

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, with multiple heuristics indicating the use of eval() and String.fromCharCode for obfuscation and execution. The critical ClamAV detection 'Pdf.Exploit.Agent-36086' strongly suggests this is an exploit document. The presence of a large JavaScript stream and the 'eval stager' heuristic indicate the script is designed to download and execute a second-stage payload. The document body was unreadable, so the rationale is based on the script and heuristic findings.

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` `80f550b140f52d6154e66f1e74ce757ac4102db5674d50cc0295782342c99ddc`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627877 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_off0001d719.bin` `e68b6d88fb4f2186fcc25fcce2aa49cf872679d704d85ae56c2b34017082bdc7`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D719	300 bytes

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