PDF malware analysis — malicious · ca6fb4e75a6d3a30

MALICIOUS

PDF

21.4 KB

MD5: 1ba6c30733094f23b08405e3c9825ca6 SHA-1: 617509a38cbced3688fa79e1efcf75204e2ca1ee SHA-256: ca6fb4e75a6d3a30e242cec54da238677a1df2d48be72e6826d2061b57551b3e

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript that utilizes the `eval()` function, a common technique for executing arbitrary code. The critical heuristic firing for CVE-2007-5659 indicates a known exploit for Adobe Reader. The embedded JavaScript streams, particularly `legacy_pdfkit_stage_000.js`, are likely responsible for exploiting this vulnerability to download and execute a second-stage payload. The reconstructed string 'v'+'ar '+'BgkSI1'+' ='+' e'+'v'+'a'+'l; v'+'ar'+' TweJW3or '+'= u'+'nes'+'cap'+'e;'+'va'+'r '+'cJnO028I3a '+'= S'+'tr'+'in'+'g;' indicates the use of eval and unescape functions for obfuscation.

Heuristics 5

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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `86052338160c47556f40ffd1529eb890725b9d185fd52a2f3b3c1c7b6e444c7b`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3648 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_obj111712_001.js` `39de52e2949b5f76421f4675a47db6fbceed965887639603053b67565f347a3f`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x1004	16118 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111713_002.js` `12a9dee4c1a3ab56948cb60679a91cf056b9947333368f356a4ed1a531d27468`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4F30	1565 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` `e1ef57e355b39268ad264cc25028a9a0e38b4699b467c94913104d44e9e6dafc`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1004	1470 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `66201566cb7b94b96d78c07e61c80e11578b5125ea85cc864e3cc788698af3dd`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4F30	79 bytes
`legacy_pdfkit_stage_002.js` `1395244c01d08e50ff89759a95cc372890850a63b5ec1b0dc2521a8b2b5a4098`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x1004	1550 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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