PDF malware analysis — malicious · 8fe5f99f635db44c

MALICIOUS

PDF

118.8 KB

MD5: 35352ccc5749e7dadd451121e83d653f SHA-1: f0a62eac63a122de64a1e3e463a13840887ecf7f SHA-256: 8fe5f99f635db44c16b5749b025019b570f093a8e06019fa3e44287f9287652e

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, which is heavily obfuscated and utilizes eval() calls and String.fromCharCode. A critical heuristic indicates this is a large comment-padded JavaScript eval stager, a common technique for executing malicious code. ClamAV also detected this file as Pdf.Exploit.Agent-36086. The primary attack pattern involves leveraging JavaScript to download and execute 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `1397f22d3bf038899c10946af9b78f2ea39c2c9b7f4b786b2960432628e62f8a`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627700 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_off0001d93c.bin` `2fd0c235557204b4e9c01830852f7b039d0dc7abb81bbe2a6e2de37cfb39250d`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D93C	200 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.