PDF malware analysis — malicious · 7dbf7f1f5a86c0fd

MALICIOUS

PDF

18.4 KB

MD5: 9a55bf2284489fe9505fe2586401b86d SHA-1: ded151b60de2e7ad579ebfc9efb7a884b6bcd1f3 SHA-256: 7dbf7f1f5a86c0fd8b93def9ed5f6f9e72907a6b88a7720e53db9dabf0e0a348

410 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains JavaScript that exploits CVE-2009-0927 using the Collab.getIcon method. The script is designed to download a second-stage payload from the URL http://happytreeporno.com/new/post.php?e=6&&. This indicates a typical exploit delivery mechanism for a downloader or initial access payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 11

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution.
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: Pdf.Exploit.CVE_2009_0927-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.CVE_2009_0927-1
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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
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://happytreeporno.com/new/post.php?e=6&&

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `d6043d4785a3d2cf805b20ec448a59002d8bcf54638750e5e0db688c9ec8849c`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	1385 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0008_001.js` `f713176eebc7f878707aa49e09c4b3aecc275baf3507014602c7c6a6585d57c5`	pdf-javascript-stream	PDF /JS object 8 at offset 0x209	18313 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_000.js` `c25defefc76c0839f4bd38fae89ed5fbf114ee8fb474322034b8f503ad4c3df0`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 8 at offset 0x1E7	1383 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `92f4d4eadb2fe82aaff243ed65c865d29c682390bcc5e8922a053ff78b8e7f63`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 8 at offset 0x209	18311 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_002.js` `67c765db854dde2b25461e10634a498668dbf524a06e6e52c29f801e7badc00e`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x1E7	19695 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_003.js` `d6629b99204a8d7e6bbab6c55658d3ca9c23013ad14efd34c40359c3b128af96`	deobfuscated-js	generic stage recovery percent-decode from decompressed stream at 0x0 at offset 0x0	18824 bytes
Detection ClamAV: Pdf.Exploit.CVE_2009_0927-1 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`combined_document_js_000.js` `ec7b120f53685948f525063ea07124c01f04f61e9b76809aec3b4aadc679d7a7`	deobfuscated-js	combined document JavaScript streams at offset 0x1E7	19699 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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