PDF malware analysis — malicious · 82411aded4f15892

MALICIOUS

PDF

4.1 KB

MD5: 1beca05bf12adfcb77c97082a697d282 SHA-1: e2a18801358dca38df0b5dc9b87afca9976bc69f SHA-256: 82411aded4f15892ff8cde9950a0935a824c01b16d062a2b1c8f0c807d345df4

66 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The `eval()` call and `String.fromCharCode` usage within the JavaScript stream suggest obfuscation and dynamic code execution. The extracted JavaScript files, particularly `acroform_b64_00.js`, are likely responsible for downloading and executing a secondary payload, which is a common technique for initial access and further system compromise. The confidence is moderate due to the lack of specific URLs or network indicators in the provided evidence.

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_obj0013_001.js` `7fd29d07cd23b692812e54afcd6a6a8239cc42bee7165f27a07558fc3aad4250`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6345 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `93ff1882162ff3af16893b5167ce7acdb6b4b32f030b91ff34c5cf71b92d176d`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3606 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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