PDF malware analysis — malicious · 19580b964fa9ca65

MALICIOUS

PDF

17.6 KB

MD5: dc2f3c7ee2c4219a2f080db5cbc59927 SHA-1: b760713b1ab5304750f974d06e148d46a09fdce6 SHA-256: 19580b964fa9ca65ddaa5366ad065c67794d1cd7afbaeb062dfa7f4e2af359f3

310 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF exploits CVE-2009-4324 using obfuscated JavaScript to download a second-stage payload. The embedded JavaScript contains a URL, http://gospeltube.com/cache/.svn/.p2/.l.php?l=1&spl=pdf_newplayer, which is used to fetch the malicious content. The use of eval() and unescape() functions, along with string concatenation, indicates an attempt to hide the malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL

Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
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.
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://gospeltube.com/cache/.svn/.p2/.l.php?l=1&spl=pdf_newplayer

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `8e1a50286b9b5d38090ef0b575730109ecbbdd3f7315dbda447f0e1b4a3f7db9`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	2718 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111712_001.js` `fb8fd5a9518823e8af375df0f8fa8c05b4d040b097f3a79a242843100fef9272`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xC62	12178 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111713_002.js` `80dda48c0502c5695284a17e9e29613953d00eff10635879c160c1f5c46cb438`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3C2A	2509 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111711_003.js` `fc2c16972b9076b8d74e48b69e2853bb05b0df0a2f223062e49d9f0d724b88a5`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	17561 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 14 long base64-like blob(s).
`javascript_obj111712_004.js` `47d4b686049f2126959004bfeec0c8f557bce9ed7aa59945c3366f6e599aecf2`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xC86	14789 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 10 long base64-like blob(s).
`javascript_obj111713_005.js` `487c921611c85cf977bd9fd76ade4b909d17e47828764e4fff2eea12c8118cfc`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3C4D	2558 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `160ad8156d08d96322f46d8b9574e1ef146327e375ac97f6e36a6244b4d6106a`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xC62	1087 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `5091795dc7dfd1e269d30a5ab394f1536cab6157b0cb74b7e26a9fdc9129a46f`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3C2A	165 bytes
`legacy_pdfkit_stage_002.js` `02f4cc1ffb7676403933ddf600310ca6f2ee695df732c9ace712477c52d6152d`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1253 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_003.js` `28b6353bdc5f6f3c4ca687166da0061ebf67c0f7cfe68bc1b8851897d8fe54d3`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xC62	6435 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 10 eval/decoder/string-building token(s).

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