PDF malware analysis — malicious · 7626fa6bc7dc2e20

MALICIOUS

PDF

3.1 KB

MD5: 86614fbdb6428f105d843b11734f25d2 SHA-1: c1dd1360239e54c3b91d961bf17d406b601e0b38 SHA-256: 7626fa6bc7dc2e20a17a0591c0f227ca94d84eaf5b1366844579e8a2c8bec20d

106 Risk Score

Malware Insights

MITRE ATT&CK

T1027 Obfuscated Files or Information T1204.002 Malicious Link: Malicious File

The PDF file contains embedded JavaScript, which is heavily obfuscated using `eval()` and `unescape()` functions. The `String.fromCharCode()` function is also used, further indicating obfuscation. The primary heuristic firings point to the execution of JavaScript within the PDF, specifically highlighting `eval()` and `unescape()` calls. While no URLs or specific download targets were extracted, the presence of obfuscated JavaScript strongly suggests the intent to download and execute a secondary payload. The extracted file name 'javascript_obj111611_000.js' is included as an IOC.

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `9864171cc4152f5d3e5671809dd40cebe1cf9319d0b8bfb0abd003cff50482db`	pdf-javascript-stream	PDF /JS object 111611 at offset 0xB3D	332 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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