PDF malware analysis — malicious · bb2e6bd30d738c69

MALICIOUS

PDF

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

MD5: 67f412b124023e72fb78cd6e494343ca SHA-1: 4ada2bedd1f3282a5c904a0b8c683d234fdd9044 SHA-256: bb2e6bd30d738c693bafb5ebc82057d851625dba668b71bddc70d96cd384ba09

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 JavaScript stream utilizes `String.fromCharCode` and an `eval()` call, suggesting obfuscation and dynamic code execution. This pattern is commonly used to download and execute further malicious payloads. The extracted artifact `javascript_obj0001_000.js` is also flagged as suspicious due to script obfuscation. The confidence is moderate due to the lack of specific IOCs like URLs or hashes within the provided evidence, and the obfuscated nature of the script.

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` `e5ee87867677e23c06e3166b8fc6331c69df3f31b01115a8626362ac045e9006`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	856 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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