PDF malware analysis — malicious · eb5eb5d050e4857c

MALICIOUS

PDF

10.9 KB Authoring application: .a

MD5: e2cc3e3b47a298f3fe876410b0cc7629 SHA-1: 9bd378afea2ffffe241a8f79a93e61dbe8ad35cf SHA-256: eb5eb5d050e4857c0de5dc2754617de18bfc8129475bdb6c6cf48124a02edf24

480 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

This PDF file contains embedded JavaScript that is heavily obfuscated using arithmetic operations and percent-encoding. The heuristics indicate that this JavaScript exploits multiple known Adobe Reader vulnerabilities, including CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The primary function of the script appears to be to download and execute a second-stage payload, though the exact nature of the payload could not be determined due to the obfuscation and incomplete scan results.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 14

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)
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.
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, or hex literals. 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)
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser exited 1. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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.
ClamAV scan did not complete on extracted artifact info CLAMAV_SCAN_INCOMPLETE

ClamAV did not complete on 7 carved artifact(s); EXTRACTED_FILE_CLAMAV may be missing for this run. The result is not cached so a later submission will retry the scan.

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0018_000.js` `7acb921ad6a94bad36dbf084fd66b9bc0949dd3a12d1a310484f76a47282a99a`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	163441 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` `385205e75b5db7f25f26b2a4912f9732d87f5f77260fee06c490b57d2d8aa805`	deobfuscated-js	arithmetic-percent decoded JavaScript object 18 at offset 0x4BA	7696 bytes
Detection ClamAV: No threats found 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` `7804f0f21f7bb6a586961ac3a4b74f97625f3412934ec4a8b3f514a5f97b25a8`	deobfuscated-js	generic stage recovery percent-decode -> percent-decode from JavaScript object 18 at offset 0x4BA	7686 bytes
Detection ClamAV: No threats found 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` `b47461ba9f0a8356148996cb737234da0517fadd94bd4b32414b9dddde32fd2d`	deobfuscated-js	generic stage recovery percent-decode -> marker-##-to-%u from JavaScript object 18 at offset 0x4BA	7612 bytes
Detection ClamAV: No threats found 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` `63e20582debc10607ade445668e0f95592f949dd8fe84267426898b5a83df620`	deobfuscated-js	generic stage recovery percent-decode -> percent-decode from JavaScript object 18 at offset 0x4BA	7602 bytes
Detection ClamAV: No threats found 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` `1175ddb0d14bbc20f2f5bbdd846b2a19c4624e6a006d917221af58f1561629b8`	deobfuscated-js	generic stage recovery percent-decode -> marker-##-to-%u from JavaScript object 18 at offset 0x4BA	6611 bytes
Detection ClamAV: No threats found 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` `8c7981b71505a1679901b993744849ac226e42f5c6d8630a0e173f0b0cd6da0d`	deobfuscated-js	generic stage recovery percent-decode -> percent-decode from JavaScript object 18 at offset 0x4BA	6601 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.