PDF malware analysis — malicious · a9f337272709eda3

MALICIOUS

PDF

118.6 KB

MD5: 085bbfb4f5f336751831b58d3fd0f81e SHA-1: a9fd63e30ef17f00060f38ee109019a92d500890 SHA-256: a9f337272709eda3437fb4194904afc4d8992f742b11af0f1cc04aa497fa6c99

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains multiple heuristic firings indicating embedded and obfuscated JavaScript, including a high-severity 'eval() call' and a 'Large comment-padded JavaScript eval stager'. The presence of these elements strongly suggests the script's purpose is to download and execute a second-stage payload. While the specific family is not identifiable, the techniques used are common for initial access and payload delivery.

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` `ec280a4d37e24a4f66b32c3f4657cdd24fd6b6c35138ca359a3e44375d24b5e2`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626739 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_off0001d6fc.bin` `e5aeb32a3de18c27f680d6604500aafc82b85a0b9850fdc5ca21042e6d5c9d58`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D6FC	300 bytes

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