PDF malware analysis — malicious · 5f191bba27558d1d

MALICIOUS

PDF

11.1 KB Authoring application: Shocked ttendants stopped being loaded trays, surrounded.

MD5: bdac253ba368d2b8d965123c5583b1aa SHA-1: 0b441ed32d6f4592e7bbb1cbc2d267255a7163fc SHA-256: 5f191bba27558d1d93c2062973d51a876eb4d22044c582f066e40c7620094f74

656 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains heavily obfuscated JavaScript that utilizes arithmetic operations and percent-encoding to reconstruct exploit code. This code targets multiple known Adobe Reader vulnerabilities, including CVE-2009-4324 (media.newPlayer), CVE-2009-0927 (Collab.getIcon), CVE-2007-5659 (Collab.collectEmailInfo), and CVE-2008-2992 (util.printf). The primary function of this script is to exploit these vulnerabilities to execute a secondary payload, likely for further system compromise.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 15

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)
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. (identified after JavaScript deobfuscation)
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH

A single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
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.
Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT

One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
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 (matched inside decoded stream)
Arithmetic percent-encoded JavaScript stager high PDF_ARITHMETIC_PERCENT_JS_STAGER

PDF JavaScript stores the hidden stage as many float*4 character code tokens separated by #, rebuilds a percent-encoded script with String.fromCharCode, then unescape/evals the recovered JavaScript. The decoder is gated on metadata-access launchers and requires recovered exploit-like Acrobat JavaScript.
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.
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 9

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0018_000.js` `11357020afaf979948f52e895a9675b2e83d630b458617266edccefc136109f0`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	164489 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`arithmetic_percent_stage_000.js` `b448520b11ff8a9471acf983fc7e5dc01a352a945786ed969772c57421993b41`	deobfuscated-js	arithmetic-percent decoded JavaScript object 18 at offset 0x4BA	7744 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_001.js` `b78fe52b8adb66e0859c176fe9d8928ee715c83ba8cb9c67cfe18c50e158e588`	deobfuscated-js	generic stage recovery percent-decode -> split-literal-normalize from JavaScript object 18 at offset 0x4BA	7741 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_002.js` `d7e86fa1de4176ef929094cb0debb51d4cd5fba0ed1c6b0767d16182ad4c9eed`	deobfuscated-js	generic stage recovery percent-decode -> percent-decode from JavaScript object 18 at offset 0x4BA	7734 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_003.js` `35ea38b61911473be894c3901985e313758cba139e60e39390fa8803f2ded04d`	deobfuscated-js	generic stage recovery percent-decode -> marker-##-to-%u from JavaScript object 18 at offset 0x4BA	7660 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_004.js` `6b17f5406e13398a719aaf62f866530e3d1894e871132a1414f2be0a12418004`	deobfuscated-js	generic stage recovery percent-decode -> percent-decode from JavaScript object 18 at offset 0x4BA	7650 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_005.js` `50630850a2e7336a8e791f5d6fc9f2093cff18ecb02a2b185b5ef06915a44079`	deobfuscated-js	generic stage recovery percent-decode -> marker-##-to-%u from JavaScript object 18 at offset 0x4BA	6647 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_006.js` `4fb25bb09a238e902c95cec70f732068b4e380fcab64a0dc488803772815664d`	deobfuscated-js	generic stage recovery percent-decode -> percent-decode from JavaScript object 18 at offset 0x4BA	6637 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_007.js` `2233c05139392c4984930e99dcd1ca38d463274599976d9b6754b98b344c5eed`	deobfuscated-js	generic stage recovery percent-decode -> split-literal-normalize -> percent-decode from JavaScript object 18 at offset 0x4BA	7731 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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