PDF malware analysis — malicious · af79ba8c5035bbfc

MALICIOUS

PDF

8.1 KB

MD5: 869e9fd4272da671df8f3b2eb435923f SHA-1: 5b0c698e7933fe656820d48c2fee5886f2ad3abe SHA-256: af79ba8c5035bbfcc862871478caa7f6ef6b38e9ae1e2eb0217f4c20d4cccb1c

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, which is heavily obfuscated and uses eval() calls. This script is designed to download and execute a second-stage payload. The presence of obfuscated JavaScript and eval() calls strongly suggests malicious intent, likely for payload delivery. No specific family could be identified due to the obfuscation.

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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_obj0005_000.js` `5e44d9c8342f729b95a9d34ec48b44ff5e5e160eff8bc990c8793a8be6e271b9`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	307 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `ce9d96917376c192ed0bf47772998316eb03dc0ff74838247dedac321a2157c0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1AA3	1857 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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