PDF malware analysis — malicious · 408a45575d28726d

MALICIOUS

PDF

26.3 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 81b9fcb7c77dea00323689024967fdf2 SHA-1: c8990cd225eed01b056a4c87b3ebed9b158b85ba SHA-256: 408a45575d28726deebce209cdf326065db56a44772778f8b90c797d4fa19b58

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a high-severity PDF_EVAL heuristic firing suggests the JavaScript is using eval() to execute code. The extracted JavaScript object, javascript_obj0001_000.js, likely contains obfuscated code that uses String.fromCharCode, as suggested by the PDF_FROMCHARCODE heuristic. This pattern is commonly used to download and execute further malicious payloads. The confidence is moderate due to the obfuscation and lack of specific IOCs beyond the use of eval().

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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `f2e949e64c61b07b2d3e2332620a5b892cce22111ae155bea11b214c4164526f`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	884 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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