PDF malware analysis — malicious · 2cb0d5ab5f41a700

MALICIOUS

PDF

15.7 KB

MD5: 1f67445cd61ac8902190007d3eed637a SHA-1: 9ee306290c548e1fc8c458cf22bb28f912922a39 SHA-256: 2cb0d5ab5f41a7001ee1d2484432942cb9b9837fbf1e811fb2a3d76fb2226a73

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, including a large, comment-padded eval stager. This JavaScript is heavily obfuscated and utilizes `eval()` and `String.fromCharCode()`, indicating an attempt to hide malicious code execution. The ClamAV detection 'Pdf.Exploit.Agent-36086' strongly suggests this is a known exploit. The primary attack pattern involves leveraging a PDF vulnerability to run this obfuscated script, which likely downloads and executes a second-stage 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` `0d7ad02796611ea27142f10d72fe3135f07b44bbf4aec3442bc5236dcd1bc421`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425187 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_off00003b67.bin` `ebf731e743d0c291f545d20412f4cbfa540c45125cc19d9d8e1b185e07f9f2af`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3B67	300 bytes
`legacy_pdfkit_stage_000.js` `feea1aae043b4b2b95951193dc433a52c3e5e62859a7b8852365eca2ed9f7d1f`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 719 long base64-like blob(s).

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