PDF malware analysis — malicious · 74fed38bd4f2f6ab

MALICIOUS

PDF

118.6 KB

MD5: a202e790a4dfcaf5ea9239635456098e SHA-1: 4396e6b24702b93943c27c0ac6c16faf31cc71a7 SHA-256: 74fed38bd4f2f6abc5eb0d79e0de9ba6c6d9861466c678d2f25f90c84b2ebcfb

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link T1566.002 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV (Pdf.Exploit.Agent-36086). Static analysis detected multiple high-severity heuristics related to JavaScript execution, including eval() calls and a large comment-padded JavaScript eval stager. The presence of embedded JavaScript streams and the detection of eval() strongly suggest that the script is designed to download and execute a second-stage payload. The document body was unreadable, but the technical indicators point to a common PDF exploit delivery mechanism.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
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_obj0006_000.js` `f5ca469c6e2ed7529a7be4a7d705cb644b438f35096d775748cb60722df2d533`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626474 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).
`stream_001_off0001d70a.bin` `0e3e353f486e8a3b3a9fd7850aef1c3425dface448d8cf97244d4fc743d1fb62`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D70A	300 bytes

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